How to Seal Painted Wooden Coasters In 6 Practical Steps

Photo of author

Written by: Mohammad Sameer

Updated on:

Wooden coasters can add a rustic touch to any home decor. However, without a protective sealant, painted wooden coasters are susceptible to damage from water rings and fading over time.

Applying a sealant is an easy process that helps preserve your decorative coasters.

Sealing painted wood is essential to protect the paint and wood from moisture damage. A sealant creates a protective barrier that repels water, preventing stains and warping.

With just a few simple steps and materials, you can seal your painted coasters to keep them looking like new for years.

In this article, you’ll learn the best methods for applying sealant to painted wooden coasters to protect them and extend their life.

We’ll go over what type of sealant to use, how to prepare the coasters, application techniques, dry time, and tips for a smooth, long-lasting seal.

With the right sealant and some basic steps, it’s easy to add a durable, water-resistant finish to hand-painted wood coasters.

Read on to learn how to properly seal your custom coasters to withstand everyday use while keeping the paint vivid and beautiful.

Gather Your Materials

Wooden coasters can add a stylish touch to your home decor. However, wooden coasters are prone to water damage if left unsealed.

Applying a protective coating helps prevent stains and warping, extending the life of your wooden coasters. Sealing them properly is simple with the right materials and techniques.

You’ll need the following supplies:

  • Wooden coasters. Ensure they are sanded smooth and free of dust.
  • Sealant. Choose either an oil-based polyurethane or a water-based variety. Oil-based seals provide better protection but take longer to dry.
  • Bristled brush or sprayer. Use a soft bristle brush to apply the sealant. A sprayer allows for an even coating.
  • Gloves and safety glasses. The sealant can irritate the skin and eyes. Take precautions.
  • Clean rags or paper towels. You’ll need these for smoothing out drips.

How to Seal Painted Wooden Coasters for Protection

How to Seal Painted Wooden Coasters In 6 Practical Steps

Painting wooden coasters adds colourful flair to your home decor. But without a protective seal, the paint can chip or wear away too easily.

Sealing painted coasters helps the paint adhere properly while providing a barrier against moisture and scratches. With a few simple steps, you can seal painted wood to make the artful designs pop while keeping them preserved.

Prep the Wood Surface

Show a character carefully sanding and cleaning the wooden coasters, with close-up shots of their meticulous work.

Before applying sealant, prepare the wooden coaster surfaces. Lightly sand the coasters with fine-grit sandpaper to smooth away any grain texture or debris. This allows the sealant to fully adhere to the wood.

Next, wipe away all dust with a clean cloth. Make sure the coasters are completely clean and dry before sealing.

Choose the Right Sealant

There are several options when picking a protective sealant for painted wood. Consider the following factors:

  • Desired finish – glossy or matte?
  • Oil-based vs. water-based? Oil-based seals offer better protection.
  • Will the coasters hold drinks? Prioritize waterproofing.

Acrylic sealants work well for painted wood. They dry quickly and provide a clear, durable coating. Outdoor polyurethane is also very protective against moisture.

Read the product labels to determine what’s best for your specific project and needs.

Apply Thin, Even Layers

Apply Thin Even Layers 1

Carefully follow the directions on your chosen sealant. Use a bristled brush to apply a thin, even layer over the entire painted coaster surface.

Avoid brushing back and forth excessively or applying too much sealant, which can create bubbles. Take your time and gently apply the sealant over the painted design.

Allow the first coat to dry completely per the product instructions before adding more layers. Two or three thin coats provide ideal protection.

Sand Lightly Between Coats

Show the character using sandpaper on the dried sealant, highlighting the gentle and methodical approach.

For a smooth finish, lightly sand the coasters with fine-grained sandpaper between coats. This helps the next layer of sealant adhere properly.

Remove any dust and debris before brushing on the next layer of sealant. Avoid sanding aggressively or you may scratch the painted design.

Allow Sealant to Cure

A heartwarming scene of the character placing the finished coasters on a table and admiring their beautifully sealed artwork.

It takes time for the protective seals to fully cure and harden. Allow the final coat to cure for 24-48 hours before using the coasters or washing them.

Read the sealant directions to confirm the exact dry time. Rushing this curing step will diminish the effectiveness of the sealant.

Enjoy Your Protected Creations!

Once fully cured, the sealant provides a durable, water-resistant barrier that helps the painted designs on your wooden coasters last. Reapply a fresh sealant layer periodically to maintain the protection.

With a few simple steps and materials, you can easily seal painted wood to preserve the art while keeping drinks condensation-free. Display your custom coasters with confidence knowing the sealant will help them withstand everyday use.

can you seal wood that has been painted?

Yes, you can seal the wood that has been painted. In fact, sealing painted wood is a good way to protect the paint from scratches, fading, and peeling. It can also help to make the paint more water-resistant and durable.

Will Mod Podge seal a coaster?

Yes, Mod Podge can seal a coaster, but it is not a perfect sealant. It is best to use Mod Podge in conjunction with another sealant, such as polyurethane or varnish, to make your coasters truly waterproof.

Here are the steps on how to seal a coaster with Mod Podge:

  1. Apply a thin coat of Mod Podge to the coaster.
  2. Let the Mod Podge dry completely.
  3. Apply a second coat of Mod Podge.
  4. Let the Mod Podge dry completely.
  5. Apply a coat of polyurethane or varnish.
  6. Let the polyurethane or varnish dry completely.

does lacquer protect against water?

Yes, lacquer is a water-resistant finish that can be used to protect wood, metal, and other materials from moisture damage. It is a clear, hard finish that dries quickly and forms a strong, durable barrier.

Lacquer can be applied by brush, spray, or roller, and it is available in a variety of finishes, including gloss, semi-gloss, and matte.

Here are some of the benefits of using lacquer to protect against water:

  • It is a clear finish, so it will not obscure the natural beauty of the material.
  • It is fast drying, so you can get your project finished quickly.
  • It is durable and long-lasting.
  • It is resistant to a variety of chemicals, including water, acids, and alkalis.

is epoxy good for coasters?

Yes, epoxy is a good material for coasters. It is clear, durable, and heat resistant, making it ideal for protecting your tables and countertops from hot drinks and scratches. Epoxy coasters are also easy to make and customize, so you can create unique pieces that reflect your personality.

Here are some of the benefits of using epoxy resin for coasters:

  • Durability: Epoxy is a very strong and durable material that can withstand a lot of wear and tear. It is also resistant to water, chemicals, and UV rays, so your coasters will stay looking good for years to come.
  • Heat resistance: Epoxy can withstand high temperatures, making it ideal for coasters that will be used for hot drinks. Most epoxy resins have a heat resistance of up to 150 degrees Fahrenheit.
  • Customizable: Epoxy is a clear resin, so you can add any type of colourant or embellishment to your coasters. You can also create different textures and finishes by pouring the resin in different ways.
  • Easy to make: Epoxy coasters are relatively easy to make at home. You can find kits and supplies at most craft stores.


What is the best sealant for painted wooden coasters?

The best sealant for painted wooden coasters is the one that best meets your needs. Consider the factors mentioned in Step 2 when making your decision.

How often should I seal my painted wooden coasters?

The frequency with which you need to seal your coasters will depend on how often they are used and the type of sealant you use. In general, you should seal them every few years.

Can I use a different type of sealant?

Yes, you can use a different type of sealant. However, it is important to choose a sealant that is compatible with the type of paint you use. For example, if you use water-based paint, you should use a water-based sealant.


Sealing your handpainted wooden coasters is an important final step to ensure their longevity. By applying a thin coat of polyurethane, you create a protective barrier that prevents moisture damage and locks in the paint. Be sure to use an oil-based polyurethane for best results.

Carefully follow the directions on the polyurethane container – apply a thin layer across the surface of each coaster using a soft-bristled brush. Allow plenty of time for the sealant to dry completely before adding additional coats. Two or three thin coats are ideal to build up a durable protective coating.

Properly sealed, your wooden coasters will withstand condensation and minor spills while keeping the painted design vibrant. The water-based polyurethane dries quickly, so your coasters will be ready to use and enjoy in no time. Give your artistic creations the protection they need by taking the time to apply the sealant correctly.

Share photos of your finished handpainted coasters online! Friends, family and social media followers will love to see your handiwork. With the simple addition of a clear acrylic protective coating, you can confidently use and display your wood coasters without worrying about water damage. Happy crafting!

Sharing Is Caring:

About Mohammad Sameer

My name is Mohammad Sameer, the founder of SoundproofGears. My hypersensitive hearing turned me into a lifelong seeker of silence. After years of research, I've become an expert on soundproofing techniques and materials. In November 2022 I launched this site to share my knowledge and help others find acoustic sanctuary. About More