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Best Sealer for OSB in 2024 | Top 5 Picks by an Expert

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OSB is a great, affordable option for flooring and sheathing, but it’s more prone to moisture damage than other materials. So it needs to be sealed first, but an ordinary sealer can not stir stick to OSB.

If you use the best sealer for OSB, it will protect your surface from moisture damage and get the job done. These sealers are designed specifically for an OSB floor and provide maximum protection against harmful elements.

But it is difficult to find out a sealer. We did some research and came up with five reviews on the top sealer. Hopefully, with these reviews, you can find the right sealer for you.

Rust-Oleum OSB Sealant

Prestige Sealer for OSB

KILZ OSB Waterproof Sealant

You can’t protect your OSB board without sealing. And if you choose the wrong sealer, it won’t work. We know that it is time-consuming for you to research all different sealers on the internet, so we did some research for you.

We have listed 5 recommended OSB sealers on the market based on their performance, reliability, and price. To help you choose the right sealer easily, we also put some recommendations for each of them.

Here we will review 5 top products on the market, which include:

1. Rust-Oleum OSB Sealant

If you are looking for a lubricating paste to protect your timber, look no further. OSB Paste Sealer By Rust-Oleum is a perfect choice.

It is a high-quality latex paint that is designed to provide excellent coverage on surfaces. When the product dries, it leaves a matte finish that hides surface imperfections. This paint is also available in a variety of colors, so you can find the perfect shade for your project.

You can use it both inside and outside. It is ideal for plaster, masonry, plywood, metal, or unglazed ceramic. The sealant comes in flat white color, and it is available in an 8 fl oz can.

Rust-Oleum OSB Sealant is a water-resistant sealant. It dries to touch in just 30 minutes, so it’s perfect for quick projects. With a roller or brush, you can apply the sealant. You can also wash it.

This flat finish sealant provides a fresh new look for surfaces. It goes on smoothly and provides excellent hide. After sanding surfaces with 180/200 grit sandpaper, you need to use a degreaser to remove grease. Let it dry before painting.

Highlighted Features:

  • Available in a variety of colors
  • Can be used for both interior and exterior applications
  • Ideal for plaster, masonry, plywood, metal, or unglazed ceramic
  • Protects OSB surfaces from water damage
  • Flat white color and comes in 8 fl oz
  • Dries to touch in just 30 minutes

2. Rust-Oleum Particle Board Sealant

If you’re looking for a high-quality sealant for your OSB, Prestige is a perfect choice. It is a gloss white paint designed for OSB sheathing. The paint can be applied to a variety of surfaces, including metal, fiberglass, and plywood.

Rust-Oleum Particle Board Sealant is a durable coating that resists abrasion and extreme weather conditions while providing UV protection. It dries to the touch in as little as 1 to 2 hours, making it easy to use.

This sealant is an oil-based formula that is flexible and applies easily with excellent leveling. You can also use it on bare wood, decks, metal, roofs, and concrete.

It is ideal for protecting OSB from the sun’s harmful UV rays. You can cover up to 100 sq ft with a single coat. The sealant is designed to give surfaces a smooth finish and superior gloss retention. It will help maintain the beauty and elegance of your surfaces.

With its abrasion-resistant design and spray application, it’s easy to use. It comes in 32.0 Fl Oz. If you live in Catalina Island, It is not available for sale.

Highlighted Features:

  • Resists abrasion and extreme weather conditions
  • Provides UV Rays protection
  • Dries to the touch in as little as 1-2 hours
  • Covers up to 100 sq ft per coat.
  • Leaves a smooth, glossy finish
  • Easy to apply with a brush or spray

3. Prestige Sealer for OSB

When you’re looking for a paint that will seal OSB and give your interior space a high-end look, this ultra premium acrylic latex by Prestige is a great option. It can be used on both indoor and outdoor surfaces and is a great option for sealing plywood, and other types of wood.

This sealer is in one is a high-quality paint that is perfect for any interior surface. It dries quickly & evenly and provides a beautiful, semi-gloss finish. It is also VOC-compliant, making it safe to use.

With this paint, you can paint your wall over uncoated stucco, plaster, drywall, or previously painted surfaces easily. It’s suitable for use in bedrooms, dining rooms, family rooms, living rooms, media rooms, and hallways.

The sealer will also help to protect the OSB from damage, making it a great option for those looking for a durable finish. With this primer, you’ll be able to hide any blemishes or imperfections. 

It can be applied with a brush, roller, or pad painter, and it dries quickly to provide a durable finish. Prestige Sealer is also water-thinned, so it can be sprayed easily.

The Prestige Sealer for OSB panels is easy to clean. It can be recoated after 1 to 2 hours. Also, the sealer is resistant to abrasion, and you can clean it with warm water and soap.

It is a quality sealant that can be used to protect and enhance the appearance of OSB boards. The sealant provides a semi-gloss finish that makes the boards look shiny and bright. It is easy to apply and dries quickly (in one hour), making it a convenient option for those who need to get the job done quickly.

The finish is good for high-humidity spaces like bathrooms and kitchens. You can wash it, too. It has a low VOC content, so it is safe for your home and the environment. The sealant comes in a dove gray color and is 128 fluid ounces.

Highlighted Features:

  • Can be used on both indoor and outdoor surfaces
  • Sealer dries quickly in one hour
  • Provides a beautiful, semi-gloss finish
  • VOC compliant and safe for use
  • Self-primers over prepared uncoated previously painted surfaces
  • Helps to hide any blemishes or imperfections on the surface

4. KILZ OSB Waterproof Sealant

The paint by KILZ is a waterproof sealant that is perfect for protecting your OSB board. This paint can be used on plywood, metal, masonry, stucco surfaces and will help to keep your property looking its best for years to come.

It is a high-quality exterior paint that is perfect for use on outdoor structures. It resists cracking, peeling, and blistering, making it a great choice for protecting your home against the elements. With its beautiful finish, KILZ OSB Waterproof Sealant can also add some extra curb appeal to your home.

This waterproof osb sealant is a paint that is designed to provide exceptional adhesion and versatility in varied conditions. The paint also features a water or oil base formula, which helps it to remove loose wood fibers, mildew, dirt, debris and mill glaze before painting.

It dries to the touch in 2-3 hours. It is ideal for vertical exterior surfaces and can be recoated after 6 to 8 hours of drying. This 1-gallon can of KILZ Paint is available in white color.

You can spray, brush, or roll on to cover 200-500 sq ft per gallon. It is perfect for highly porous surfaces like processed wood and drywall and will keep a wet edge while being applied. It is also back-brushable or back-rollable, making it easy to use no matter what method you choose.

Highlighted Features:

  • Can be used on wood, metal, masonry, stucco surfaces
  • Resists cracking, peeling, and blistering
  • Features a water or oil-base formula
  • Remove loose wood fibers, mildew, dirt, debris, and mill glaze
  • Dries to the touch in 2-3 hours
  • Can be recoated after 6 to 8 hours of drying

5. Krylon OSB Waterproof Sealer

If you’re looking for a way to seal OSB board, the sealer by Krylon is the perfect product for you. The aint is a great option for both indoor and outdoor use.

The paint is available in many colors, and it dries to a gloss finish. The exterior waterproof paint will help to protect the wood from water and other weather-related damages. 

It is a high-quality acrylic latex paint that can be used on a variety of surfaces, including plywood, metal, plastic, ceramic, drywall, wicker, and masonry. It provides superior coverage and color while also delivering durability and adhesion.

Krylon OSB Waterproof Sealer is a gloss acrylic latex paint that is designed for indoor and outdoor use. It gives you great coverage for DIY and craft projects. Moreover, the sealer has a glossy finish, which will give your project a sleek and modern look.

It has an easy application, a smooth finish, and easy soap and water cleanup. Within an hour, it’ll be dry to the touch, covering up to 25 square feet. It comes in a can with 128 oz of essential ingredients that are needed to seal the board.

So if you’re looking for a way to keep your OSB projects looking great for years to come, be sure to try this waterproof sealer.

Highlighted Features:

  • A gloss acrylic latex paint
  • Designed for indoor and outdoor use
  • Provides superior coverage and black color
  • Protects the wood from water damages
  • Has a glossy finish to give a sleek and modern look
  • Dries to touch in one hour and covers up to 25 sq ft.

We end our reviews here. We hope that these five products have helped you in your search for the best OSB sealer. These sealants will keep the boards dry and free of mold and mildew.

Factors to Consider When Buying a Sealer for OSB Panel

polyester resin filler

If you want to use OSB, you need to take extra precautions to protect it from moisture content. If your project will be exposed to the elements or if it is going to be frequently rained on, then you need a top-notch sealant.

One of the most common questions is what type of sealer they should use on their OSB subfloor. The sealer you put down will ultimately determine how long your floor lasts and how easy it is to clean. There are also a variety of factors that play into choosing the right sealer, including:


White and grey OSB sealer are the most common colors. Grey is less common but has a more elegant look. These paints reflect light which makes the flooring appear brighter in a room, giving off a clean and professional look.

Finish Type:

These sealants and paints come in two different types: matte and semi-gloss. Matte finishes are much more popular than semi-gloss, for a variety of reasons. The most important reason is that the finish helps to hide imperfections such as scratches or scuffs that can happen over time.

Dry and Cure time:

These products all have their own curing times, which means the amount of time it takes to completely dry. Some sealants can take as long as 48 hours to cure, whereas others will only need a couple hours to dry properly.


osb's water resistance

All of these sealants and paints have a distinct smell when they are drying or curing. Some products have a much stronger odor than others, which can make the project very unpleasant.


Sealants that are not water proof will soak up any moisture that comes into contact with them. They end up feeling tacky to the touch when in humid climates and in certain areas of a home. So you should use a product that adds water and moisture protection while contact with water.

UV Resistant:

UV rays from the sun can damage a lot of different types of flooring materials. This is because they contain certain oils that will dry out and leave the surface looking dull over time. You want a sealer that is UV-resistant so that it keeps its shine for as long as possible.

Abrasion Resistant:

When dealing with roof sheathing, abrasion resistance is a very important feature to have. Some products are made of thicker materials that resist scratching better than others.


These sealants and paints all have different VOC levels. The lower the VOC level, the less harsh chemicals are in the product. Some products contain up to 50% VOCs, which means that they are much more toxic and dangerous to use around pets or children.

These are the top priorities to consider when picking the best sealer for roof or wall sheathing. With all of these factors in mind, you should be able to find the right product that will protect your flooring while also making it look new and attractive.


01. What Can I Put on OSB to Make it Waterproof?

Sealers are the perfect way to make the board waterproof. From paints to sprays, water-based sealants can be used on all types of OSB surfaces.

02. Can You Use Flex Seal on OSB?

Flex seal can be used on all types of OSB surfaces. Flex seal is an elastomeric liquid rubber product that can be used to waterproof OSB boards for outside projects.

03. How to Protect Plywood from Water?

The plywood will create a smooth surface for you to work with. OSb sealant will help the plywood resist water and other types of damage.

04. Can OSB Be Used Outside?

Yes, the oriented strand board can be used outside. The only downside is that the boards are not naturally resistant to water. However, sealants will help protect your project from moisture damage.

05. How Long Will OSB Last Outside?

OSB will last a few weeks to months depending on several factors including exposure to sunlight and weather conditions. If you seal your OSB, the boards can last many years outside.

06. Will PVA Seal OSB?

Will PVA Seal OSB

Yes, polyvinyl acetate (PVA) is water-resistant and can be used as a sealant on OSB surfaces. Since it is not waterproof, it lasts short periods outside.

07. Rust-Oleum OSB Sealant vs AFM Safecoat Safe Seal: Which is better?

We suggest using Rust-Oleum OSB sheet sealant instead of AFM Safe Seal Plywood & OSB Sealer. The AFM sealer has a lot of issues. It takes too long to dry.

The Rust-Oleum OSB sealant provides water resistance and UV protection. This means that the product will protect your boards during harsh weather conditions and keep them looking new for longer periods of time.


OSB is a good substitute for other woods in certain applications. To make sure that your OSB will last, you need the best sealer for OSB panels.

You won’t have to worry about your OSB being affected by water, exterior conditions, or weather damage with the right sealant in place. While there are many types of sealers, you will only need the right sealer for OSB panels.

When you’re not sure what sealer to buy, consider some of the brands we’ve reviewed here. We believe you will never be frustrated with our recommended products.

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