How to Seal Paint on Clay

Turning ordinary clay into a vibrant work of art is so rewarding. However, sealing the paint to protect your creation can feel overwhelming with so many product options and techniques to consider. I’ve made more than my fair share of mistakes over the years, from paintings that flaked at the first touch to colors that faded beyond recognition after just a few months on display. 

But through lots of experimentation, I’ve narrowed down a simple four-step process using inexpensive materials that reliably seal clay no matter the paints or glazes used. In this post, I’ll walk through the exact steps on how to seal paint on clay so the colors stay bright for years to come.

More importantly, I’ll help you avoid the pitfalls that led me to develop this method. By the end, you’ll feel confident taking your clay artwork from the easel to the exhibition with a finish that stands the test of time.

Necessary Items

• A Good Quality Sealant: You can choose from a wide range of bonds available in the market. The type of paint or glaze you use will also dictate the best kind of sealant for your project.
• Paintbrushes: Make sure to have a variety of paintbrushes on hand for different sizes and effects. Using high-quality brushes that won’t shed hair onto your wet clay surface is essential.
• A Clean, Dry Cloth: This will be used to wipe off any excess sealant or clean up any spills during sealing.
• Protective Gear: Depending on the type of sealant you choose, wearing gloves and using proper ventilation while working with it may be necessary.

10 Steps on How to Seal Paint on Clay

Step 1: Prepare Your Clay Piece

Before sealing your clay piece, make sure it is scorched. Depending on the thickness and type of clay used, this can take anywhere from a few days to a couple of weeks. It’s essential to be patient and not rush the drying process, as any moisture trapped inside can cause issues later on.

Step 2: Choose Your Sealant

As mentioned earlier, choosing a sealant specifically designed for use on clay surfaces is essential. Acrylic-based sealers work best for painted clay pieces, while polyurethane or epoxy sealers are better for glazed details. Reading the label and choosing a product compatible with your paints or glazes is essential.

Step 3: Prepare Your Work Area

Lay a protective covering over your work surface, such as newspaper or a plastic sheet, to catch any drips or spills. Ensure your work area is well-ventilated, especially if using a sealant with strong fumes.

Step 4: Test on a Small Area

Before applying the sealant to your entire piece, it’s always a good idea to test it on a small, inconspicuous area first. This will allow you to see how the sealant affects your colors and if any adjustments need to be made before sealing the entire piece.

Step 5: Apply the First Coat

Using a clean paintbrush, apply a thin and even coat of sealant over your clay piece. Work in one direction to avoid brush marks, and cover all surfaces, including edges and crevices. Allow the first coat to dry completely before moving on to the next step.

Step 6: Sand Down Imperfections

After thoroughly drying the first coat, gently sand down any imperfections or brush marks with fine-grit sandpaper. This will create a smooth surface for the next coat of sealant and ensure a professional-looking finish.

Step 7: Apply Additional Coats

Depending on the type of sealant and desired level of protection, you may need to apply multiple coats. Make sure to follow the manufacturer’s recommendations for drying time between coats.

Step 8: Cure Your Piece

Once all coats have been applied and thoroughly dried, it’s important to cure your clay piece according to the sealant instructions. This usually involves baking the work in an oven at a specific temperature for a long time.

Step 9: Buff and Polish

After curing, your clay piece may have a slightly rough or matte texture. To achieve a glossy finish, gently buff the surface with a soft cloth or use a polishing compound designed for use on clay surfaces.

Step 10: Display and Enjoy!

Congratulations, you have successfully sealed your clay piece, and it’s now ready to be displayed or gifted. Make sure to handle your creation with care and avoid exposing it to harsh chemicals or extreme temperatures.

8 Additional Tips for Sealing Paint on Clay

1. Make Sure to Clean Your Paintbrushes Thoroughly After Use

Any leftover sealant on your paintbrushes can cause them to harden and become unusable. To avoid this, clean your brushes with warm water and mild soap afterward.

2. Use Thin Coats for a Smooth Finish

It’s better to apply multiple thin coats of sealant than one thick coat, resulting in a smoother and more even finish.

3. Seal Your Clay Piece Before Adding Any Finishing Touches

If you plan to add any additional embellishments or details to your clay piece, seal it before applying them. This will prevent the sealant from accidentally covering or damaging your final touches.

4. Avoid Shaking the Sealant Bottle

Shaking a sealant bottle can introduce air bubbles into the liquid, leading to an uneven application. Instead, stir the sealant gently before use.

5. Wear Protective Gear

Some sealants can be harmful if they come into contact with your skin or are inhaled. Read the safety precautions on the label and wear protective gear as necessary.

6. Allow Your Clay Piece to Dry Completely Before Sealing

It’s essential to thoroughly dry your clay piece before applying any sealant. This will prevent any cracking or bubbling if moisture is trapped inside.

7. Choose the Right Sealant for Your Desired Finish

If you want a glossy finish, choose a sealant with a gloss sheen. For a matte finish, opt for a flat or satin sheen sealant.

8. Store Your Sealed Clay Piece in a Safe Place

To keep your sealed clay piece looking its best, store it in a cool, dry place away from direct sunlight. This will help prevent any fading or damage over time.

Frequently Asked Questions

Can I Use a Sealant on Air-dry Clay?

Yes, you can use a sealant on air-dry clay if it is specifically designed for porous surfaces and compatible with the paint or finish type. Make sure to read the label and test on a small area first.

How Often Should I Reapply Sealant?

The frequency of reapplying sealant will depend on the type and quality of the product used and the level of wear and tear on your clay piece. It’s best to check the manufacturer’s recommendations for specific guidance.

Can I Use a Spray Sealant?

Spray sealants can be used on clay, but they may not provide as thick or even of a coat as using a Paintbrush. They are best for small and straightforward pieces or adding a glossy finish to an already sealed article.

Should I Seal My Clay Piece Before Painting?

Sealing your clay piece after painting is generally recommended, as the sealant can act as a barrier and prevent proper paint adhesion. However, if you are using water-based clay and plan on using watercolor or acrylic paints, you may be able to skip the sealing step. Test on a small area first to see how the paint reacts.

Can I Use Nail Polish as a Sealant?

Nail polish is not a suitable sealant for clay. It may provide temporary protection but is not designed to adhere well to porous surfaces and will eventually chip or peel off.  Remember always to use a sealant made explicitly for sealing clay projects.

Can I Seal Polymer Clay with Glaze Instead of a Sealant?

Yes, glaze can be used as a sealant for polymer clay. However, choose a glaze compatible with the type of paint or finish used and follow all instructions carefully. Some kinds of glaze may require additional curing time or heat setting.

What Should I Do If My Sealant Causes Bubbling?

If your sealant causes bubbling on your clay piece, it could be due to moisture trapped inside or an incompatible combination of materials. Allow the piece to dry completely, and gently sand down any bubbles before applying a new coat of sealant.

How Can I Clean Sealed Clay Pieces?

Sealed clay pieces can be cleaned with a mild soap and water solution using a soft cloth or sponge. Avoid harsh chemicals or abrasive cleaners, which may damage the sealant or paint.

Can I Seal Paint on Other Types of Clay?

Yes, you can use similar techniques to seal paint on other types of clay, such as ceramic, porcelain, or earthenware. However, make sure to choose a sealant specifically designed for the type of clay you use. 

Always test a small area before applying it to the entire piece.  Remember that different clay types may require different sealant techniques, so it’s best to research and follow manufacturer recommendations for optimal results.

Is There a Difference Between a Sealant and a Varnish?

Sealants are designed for porous surfaces like clay, while varnish is typically used on non-porous surfaces like wood or metal. They may have similar properties, but using the appropriate product for your project is essential to ensure a successful seal.  If unsure, test on a small area before applying it to the entire piece.

Conclusion

Sealing paint on clay is essential in preserving and protecting your creations. Sealing paint on clay doesn’t have to be a daunting task. You can protect your artwork and ensure its longevity with suitable materials and techniques. Remember to choose a sealant specifically designed for use on clay, test it before applying, and follow all instructions carefully.

By following these additional tips, you can ensure a successful and professional-looking seal on your painted clay pieces. Now go forth and create with confidence! This brings us to the end of our guide on how to seal paint on clay. We hope this has been helpful and that you are ready to preserve your beautiful clay creations for years.