Table of Contents
Sealing plywood is a topic that can seem daunting at first, but it doesn’t have to be. In this article, we will discuss how to seal plywood for outdoor use and what you need in order to do so. This article will also include some tips on the best way to protect your new deck from water damage.
Reasons For Sealing Plywood
- Protection from moisture and water damage: Plywood is prone to warping, splitting, and rotting when exposed to moisture. To protect the wood against any possible water damage, seal it off with a protective coating – an especially crucial step if you are planning on using plywood in outdoor projects that could be confronted with rain, snow, or high humidity levels. This will create a barrier between your project and the elements so you can rest assured your work won’t succumb to damaging liquids. For instance, a garden shed made of plywood can be exposed to moisture from rainwater and soil, which can cause rotting and deterioration. Sealing the plywood with a waterproof sealant protects it from water damage.
- Resistance to rot and decay: Plywood consists of various layers of wood that are bound together using adhesive. The glue, however, can slowly degrade when exposed to moisture and the resin may even separate from its wooden counterparts; resulting in decomposition. Sealing your plywood is a great way to avert this by constructing an impenetrable boundary that keeps any unwanted water out. For example, a plywood deck that is not sealed can rot and decay over time due to exposure to water and moisture. Sealing the plywood with a marine-grade sealant can prevent this from happening.
- Preventing warping and splitting: Plywood can easily get warped and divided when exposed to fluctuations in temperature and humidity. To reduce the potential for damage, sealing is essential as this will limit the amount of moisture that can seep into the wood. For instance, a plywood fence that is not sealed can warp and split due to exposure to different weather conditions. Sealing the plywood with an oil-based or water-based sealant can prevent this from happening.
- Protection from UV rays and weather elements: Plywood is liable to discoloration, fading, and deterioration when exposed to the sun and other harsh weather conditions. Sealing creates a defensive barrier that decreases UV ray exposure, thus curtailing any possible damage from continual rainfall or extreme temperatures. For example, a plywood boat that is not sealed can fade and discolor due to exposure to sunlight and saltwater. Sealing the plywood with a marine-grade sealant protects it from UV rays and saltwater damage.
- Enhancing the appearance of the plywood: Applying a sealant to the plywood can help it appear more polished and lustrous – something that’s especially beneficial when utilizing plywood on exterior projects like pergolas or fences. For instance, a plywood picnic table that is not sealed can look dull and worn out over time. Sealing the plywood with a clear sealant can enhance its appearance and make it look brand new.
- Improving durability and lifespan: Plywood can become more durable and long-lasting when it is properly sealed, making it an ideal choice for outdoor projects that experience different kinds of weather as well as constant use. For example, a plywood deck that is not sealed can wear out and deteriorate over time due to foot traffic and exposure to the sun and rain. Sealing plywood with a durable sealant can improve its durability and extend its lifespan.
Types of Sealants Used to Seal Plywood for Outdoor Use
- Oil-based sealants: For outdoor projects that are routinely exposed to moisture and other weather elements like decks, fences, and furniture, oil-based sealants provide a perfect solution. Crafted from natural oils such as pine tar or tung oil as well as resins like linseed oil, these penetrating sealants deliver an elegant matte finish while protecting the wood beneath it against harsh conditions. For example, an oil-based sealant can be used to seal the plywood of a garden bench to protect it from rainwater and humidity.
- Water-based sealants: For a swift and effortless sealing solution, nothing beats water-based sealants made from acrylic or polyurethane. Their simple application process and quick drying times make them perfect for any outdoor project such as birdhouses, planters, and even small structures. Plus the glossy finish adds an extra touch of shine to your projects that will be sure to garner attention. For example, a water-based sealant can be used to seal the plywood of a birdhouse to protect it from rainwater and sun exposure.
- Marine-grade sealants: Marine-grade sealants are the perfect choice for protecting boats, docks, and other outdoor projects exposed to saltwater, intense humidity, and inclement weather conditions. Crafted from advanced resins designed to resist water damage, UV rays, and other environmental factors – these resilient products provide long-lasting protection no matter where your next nautical adventure takes you. For example, a marine-grade sealant can be used to seal the plywood of a boat to protect it from saltwater and sun damage.
- Polyurethane sealants: Polyurethane sealants are constructed from synthetic resins, resulting in a beautiful clear gloss finish. They provide extraordinary protection against water, UV rays, and other weather conditions – perfect for outdoor projects such as decks, fences, patios, or your favorite outdoor furniture. These durable coatings will ensure that all of your exterior fixtures remain safeguarded and look great through any season. For example, a polyurethane sealant can be used to seal the plywood of a deck to protect it from rainwater and sun exposure.
- Epoxy sealants: Epoxy sealants are an ideal solution for outdoor projects that call for superior protection against water and moisture. Created from two-part resins, epoxy sealants provide a robust, resilient barrier that is perfect for boats or dock repair as well as sculptures in exposed areas. For example, an epoxy sealant can be used to seal the plywood of a boat to protect it from water damage and weather elements.
Methods Used to Seal Plywood for Outdoor Use
- Brushing: Applying a sealant to plywood for outdoor use is most easily accomplished with brushing. This method requires the use of a paintbrush and includes spreading the sealant evenly across the surface, ensuring even coverage on small projects such as birdhouses or other outdoor structures. Brushing offers ultimate precision ideal for any task requiring detailed accuracy in its sealing process. Brushing is the ideal solution for any project that needs multiple coats of sealant, as wielding a brush provides greater precision in deciding how much sealing product to use. For example, a brush can be used to apply a water-based sealant to the plywood of a birdhouse.
- Rolling: When it comes to outdoor plywood projects, such as decks or fences, rolling is an efficient and effective method for applying a sealant. Using a paint roller ensures that the sealant is spread evenly across the surface of the wood quickly and easily – perfect for larger-scale jobs. Rolling also helps to create a smooth finish which may be desired in certain applications. For example, a roller can be used to apply a polyurethane sealant to the plywood of a deck.
- Spraying: Applying sealant with a spray gun is an ideal technique for outdoor projects requiring quick and even coverage. Think of boatbuilding, or coating large sculptures – this method enables you to cover the surface far more speedily than manual brushing or rolling would ever permit. Plus, it also ensures that your plywood gets evenly coated in a thin layer of protection against moisture and other elements. Spraying offers a reliable solution for any woodworking project. For example, a spray gun can be used to apply a marine-grade sealant to the plywood of a boat.
- Dipping: If you’re looking for a straightforward and time-efficient way to protect your outdoor DIY projects, dipping is the perfect solution. By submerging plywood into sealant in a container, it allows for optimal saturation of even small items such as planters or garden boxes. This method ensures that the applied sealant penetrates every nook and cranny while still allowing quick removal of the material from its bath. For example, dipping can be used to apply an oil-based sealant to the plywood of a garden planter.
- Wood Conditioner: This is the best option if you are looking to seal plywood for outdoor use because it helps protect your deck against moisture damage. This type of wood finishing product contains chemicals that will help prevent warping and splitting, which can save you money in repairs later on down the road. The main downside is that this method usually requires more than one coat, so it can be a little more time-consuming.
- Wipe on Polyurethane: If you are looking for a method that is quick and easy, then wipe-on sealant may be right for you. This type of finish only takes about an hour to dry so it can save some time in the long run. It also penetrates deep into the wood fibers which helps protect your deck from moisture damage.
- Spray on Polyurethane: Spray-on sealant is the fastest method available for sealing plywood for outdoor use. It can be applied in as little as 30 minutes, but it’s important to note that this type of finish doesn’t penetrate deep into the wood fibers like wipe-on finishes do which means you may need multiple coats if you want to get the best protection from water damage.
Importance of Using Sealant to Seal Plywood for Outdoor Use
- Protection from moisture and water damage: Plywood is susceptible to damage from water and moisture, which can lead to warping, swelling, or rotting. Applying a waterproof sealant on the plywood not only safeguards it against such damages but also makes it suitable for outdoor use. For example, a water-based sealant can be used to seal the plywood of an outdoor shed, preventing water from seeping into the wood and causing damage.
- Resistance to rot and decay: Protecting plywood from the deteriorating effects of humidity and oxygen is as simple as applying a rot-resistant sealant. This will increase its durability, extend its longevity, and help protect it from rotting or decaying over time. For example, a marine-grade sealant can be used to seal the plywood of a boat, preventing rot and decay from occurring.
- Preventing warping and splitting: To keep the plywood from warping or splitting due to fluctuating temperatures and humidity, it is critical to apply a sealant. Not only will this protect the wood against common environmental elements, but also ensure that its structural integrity remains intact. For example, an oil-based sealant can be used to seal the plywood of an outdoor table, preventing it from warping or splitting over time.
- Protection from UV rays and weather elements: Exposing plywood to direct sunlight and other extreme weather conditions can cause it to become faded, cracked, or damaged. To safeguard your investment in plywood and make sure that it remains undamaged for years to come, use a UV-resistant sealant when sealing the wood surface – this will protect against sun damage and help prolong its lifespan. For example, a polyurethane sealant can be used to seal the plywood of an outdoor bench, protecting it from the sun’s rays and other weather elements.
- Enhancing the appearance of the plywood: Enhancing the look of your plywood with sealants is a great way to make it more visually appealing and attractive. With an array of colors and finishes available, you can tailor-make the appearance and design according to your desires. For example, a clear epoxy sealant can be used to seal the plywood of an outdoor bar, enhancing its natural wood grain and color.
- Improving durability and lifespan: Applying a sealant to plywood shields it from the damaging effects of weather, wear and tear – making it resilient for outdoor projects. Enhancing its longevity, sealing your plywood helps ensure that your project stands strong through the test of time. For example, a marine-grade sealant can be used to seal the plywood of a dock, ensuring that it remains strong and durable for many years.
- Cost-effective: Investing in a sealant to protect your plywood is both economical and simple. DIY outdoor projects can benefit greatly from the low-cost, and effortless application of such products – an ideal choice that offers significant longevity for your wood. For example, a water-based sealant can be used to seal the plywood of a garden bed, providing an affordable and effective way to protect it from water damage.
- Easy to apply: Applying sealant to plywood is an effortless job that requires basic tools and materials. Depending on the kind of sealing, it can be administered with a brush, roller, spray gun, or even dunking into a container full of sealer – giving DIYers from all backgrounds the opportunity to tackle this project. For example, a polyurethane sealant can be applied to the plywood of a deck using a paint roller, making it an easy process.
Factors to Consider Before Sealing Plywood for Outdoor Use
- The location and environment of the project: Before sealing plywood for external use, it’s important to contemplate the area and atmosphere where your project is situated. This is because diverse climates have dissimilar weather conditions, temperatures, and levels of moisture. For example, if the project is in a coastal area, the plywood is likely to be exposed to high humidity, saltwater, and UV rays. Understanding the environment helps in selecting the right type of sealant and application method to ensure maximum protection.
- Type of wood used: When selecting the type of sealant to use for a project, it’s essential to take into consideration what kind of wood is used. While some woods are naturally resilient and impervious to issues like rot and decay, others may be less so and more prone to damage if not properly sealed with an appropriate sealant. For instance, cedar, redwood, and cypress are known for their natural resistance to rot and insects, while pine and fir are less durable.
- Type of sealant: When it comes to selecting the right sealant for a project, there is no one-size-fits-all approach! It’s important to evaluate various kinds of sealants and their unique properties, strengths, and weaknesses. This way you can ensure that your choice best fits your needs given the environment or type of wood used in the project. For example, marine-grade sealants are ideal for projects that will be in contact with water, while polyurethane sealants are suitable for projects that require high UV resistance.
- Application method: When it comes to waterproofing plywood for outdoor use, the application method is a significant detail to consider. Brushing, rolling, spraying and dipping are all viable options depending on the scale of your project, sealant preference, and personal taste. To ensure the proper protection against water exposure and other weather elements outside, be sure to choose an appropriate application technique.
- Drying time: The drying time of the sealant is paramount because it determines how long it will take to achieve completion. It’s critical to analyze the drying period for different types of sealants, as this could have a major impact on when your project finishes. Taking into account the specific timing aspects associated with your chosen brand of sealant can guarantee that everything remains within schedule.
- Maintenance requirements: To guarantee optimal protection for your plywood, sealants must be regularly tended to. Therefore, it is essential to think about the maintenance needs of the particular type of sealant used and factor in both the cost and time necessary for upkeep.
- Budget: When selecting a sealant and application method for outdoor plywood projects, budget is paramount. With options ranging in price and performance, it’s essential to find the most cost-effective solution that meets your requirements.
- Personal preferences: Ultimately, the type of sealant and application method utilized should factor in personal preferences. For instance, some may opt for brush-based products instead of spray applications while others may select oil-based polyurethane over water-based ones. Since the outcome must satisfy project owners’ objectives, it is important to remember individual inclinations when making a selection.
How to Seal Plywood for Outdoor Use in 8 Easy Steps
Tools Needed to Seal Plywood for Outdoor Use
- Paint roller
- Paint tray
- Sealant of your choice
- A brush to spread the sealer evenly across all surfaces of plywood
- Stir stick or stirrer for a paint tray
- Dust mask if using oil-based polyurethane that contains harmful chemicals.
- Soft cloth for removing excess sealer
- Rags to wipe up spills or messes
- Warm water and soap
Step 1: Sand the plywood
Start by sanding the surface of the plywood. Sanding the surface will help remove any roughness, splinters, or debris that may hinder the absorption of the sealant. Use a medium-grit sandpaper to gently sand the surface of the plywood.
Step 2: Clean the plywood
Use a damp cloth to wipe the surface of the plywood to remove any sawdust or debris from sanding. Ensure the surface is clean and dry before applying the sealant.
Step 3: Apply the sealant
Apply the sealant using a brush, roller, or sprayer, or dip the plywood in the sealant. Ensure that the sealant is applied evenly on the surface of the plywood.
Step 4: Spread the sealant evenly
Use a brush or roller to spread the sealant evenly across the surface of the plywood. Ensure that the sealant is spread evenly, avoiding any thick or thin spots.
Step 5: Allow the sealant to dry
Allow the sealant to dry according to the manufacturer’s instructions. This may take a few hours to a few days depending on the type of sealant used.
Step 6: Sand the surface
After the sealant has dried, sand the surface of the plywood gently with fine-grit sandpaper. This will help smooth out any bumps or ridges that may have formed during the sealing process.
Step 7: Apply a second coat (optional)
If desired, apply a second coat of sealant to the plywood surface. This will provide additional protection and help prolong the lifespan of the plywood.
Step 8: Allow the sealant to cure
Allow the sealant to cure according to the manufacturer’s instructions. This may take a few days to a week depending on the type of sealant used. Once cured, the plywood is ready for use in outdoor applications.
Tips on How to Protect Your Plywood from Water Damage
- Avoid Direct Exposure to Water: Safeguard your plywood from water damage by blocking it from direct contact with H2O. Utilize a shelter or umbrella to keep the raindrops off of the wood and ensure its longevity.
- Use Proper Drainage Systems: If your project requires water or regular rain, proper drainage systems are essential. For instance, when constructing a deck, make sure to leave spaces between the boards for the moisture to be able to escape through.
- Use Waterproof Glue: When piecing together your plywood masterpiece, use waterproof glue to protect the joints from water infiltration that may otherwise result in costly damage.
- Apply Sealant Regularly: Taking precautionary measures is key to avoiding water destruction, and one such way is through regular application of sealant. Make sure you don’t forget a single edge – ensure that all sides of the plywood are fully coated for optimal protection.
- Avoid Painting Over Unsealed Plywood: Before you start painting your plywood project, ensure that it is properly sealed. Forgoing this crucial step can trap moisture and eventually cause water damage if left unchecked.
- Use Marine-Grade Plywood: For projects that are constantly exposed to water and moisture, marine-grade plywood is the ideal choice. This type of plywood is specifically designed for these conditions, giving you a reliable solution for long-term durability. Don’t let your project get ruined – use marine-grade plywood.
- Store Plywood in a Dry Location: For optimal protection against water damage, store your plywood in a dry environment. Whenever you can, house it inside or beneath a cover to guarantee that the wood is kept safe and secure. Taking this precaution will make sure your project has the best start possible.
- Apply Varnish or Paint for Extra Protection: To ensure further protection from water damage, apply a layer of paint or varnish to your plywood. But first – remember to seal the wood for optimal results.
Pros And Cons of Sealing Plywood for Outdoor Use
Pros
- Adds protection to the wood.
- Will last for years without the need for reapplication every few months or so depending on how much foot traffic it gets.
- Withstands outdoor weathering damage.
- Prevents your deck from fading over time and becoming discolored due to age too!
Cons
- If using oil-based polyurethane can be harmful to the environment and your health if not used correctly.
- The sealant may not last all winter long in colder climates.
- Might need extra protection from sun damage depending on the location of the deck.
Safety Precautions When Sealing Plywood for Outdoor Use
- Use protective gear: To protect yourself from any dangerous substances when sealing plywood, it is necessary to wear the proper safety equipment. This includes protective gloves, goggles, and a respirator mask.
- Work in a well-ventilated area: Since sealing plywood can generate hazardous fumes, it is essential to work in a space with proper air flow – whether that be outdoors or in an area such as a workshop with open windows and doors.
- Keep away from heat sources and flames: It’s critical to bear in mind that sealants are combustible and must always be kept far away from flames or sources of heat, as they could easily catch fire. And it is highly recommended not to smoke while working with sealants because even the smallest spark may cause an unwanted blaze.
- Read the manufacturer’s instructions carefully: Before utilizing any sealant, it is a must that one attentively reads the manufacturer’s instructions. Doing so ensures proper and secure use of the product, as well as its optimal performance.
- Avoid ingestion or skin contact with sealant: Working with sealants always requires safety precautions, as they are composed of dangerous chemicals. To remain safe and healthy while handling them, it is critical to abstain from eating, drinking, or smoking around the product and equip yourself with protective gear.
- Store sealant in a safe location: Ensure the safekeeping of sealants by keeping them out of reach from children and animals. Likewise, it is essential to maintain a room-temperature environment to protect against any potential destruction.
- Dispose of sealant properly: It is important to properly discard sealants, as they are classified as hazardous waste. To ensure you are disposing of it correctly, contact your local government for exact instructions or safely drop off the material at a hazardous disposal center. Never dispose of used sealant in typical household garbage bins nor pour it down any drain.
FAQs
What is the best type of sealant for outdoor use?
The best type of sealant for outdoor use is a marine-grade sealant. It is specifically formulated to protect wood from moisture damage and other environmental elements that can cause deterioration.
How long does it take for sealant to dry?
The drying time for sealant can vary depending on the type of sealant used and the environmental conditions. Typically, it can take anywhere from a few hours to several days for the sealant to dry completely.
Can I use regular plywood for outdoor projects?
Regular plywood can be used for outdoor projects, but it is important to ensure that it is properly sealed to protect it from moisture and weather damage. Marine-grade plywood is recommended for outdoor projects, as it is designed to withstand the elements.
Can I apply sealant over painted or stained plywood?
It is not recommended to apply sealant over painted or stained plywood, as it may not adhere properly and can lead to discoloration or peeling. It is best to sand down the surface and apply the sealant directly to the wood.
How often should I reapply sealant to my outdoor plywood?
The frequency of sealant reapplication will depend on the location and environmental conditions of the plywood. In general, it is recommended to reapply sealant every 1-3 years to maintain optimal protection.
Can I use a pressure washer to clean sealed plywood?
It is not recommended to use a pressure washer to clean sealed plywood, as it can strip away the sealant and damage the wood. It is best to use a gentle cleaning solution and a soft brush or cloth to clean the surface.
Conclusion On How to Seal Plywood for Outdoor Use
Sealing plywood is an important step in protecting your investment from weathering damage, fading, and warping. Be sure to follow the steps outlined in this blog post and use the proper safety precautions when doing so. And if you have any questions, feel free to reach out to us and we would be happy to help.
Related: How To Seal Birch Plywood
1 thought on “How To Seal Plywood for Outdoor Use In 8 Easy Steps”
Comments are closed.