Best Heat Resistant Sealants for Homemade Ashtrays

Creating ashtrays from air-dry clay is a fun and artistic project. To make sure your ashtrays are durable and functional, you need to seal them with a heat-resistant sealant. This guide>

Overview of Sealants Suitable for High Temperatures

For making ashtrays with air-dry clay, you'll want a sealant that can withstand the high temperatures that hot ashes or cigarette butts might produce. Here are the options we recommend:

High-Temperature Silicone Sealant

High-temperature silicone sealants can withstand temperatures up to 500°F (260°C) or more. These sealants are flexible, waterproof, and provide a good seal. Many automotive-grade high-temperature silicone sealants, like those used for head gaskets, are a good option. Check the product specifications to ensure the sealant can handle the heat from burning cigarettes.

High-Temperature Epoxy Resin

Epoxy resins designed for high temperatures can also be used. They are durable and can handle heat well, making them suitable for sealing clay items that will come into contact with hot materials. High-temperature epoxy resins are available at auto supply stores.

High-Temperature Polyurethane Sealant

Look for polyurethane sealants with high-temperature ratings. Check the product specifications to confirm their heat resistance. These sealants are flexible and waterproof, similar to silicone sealants.

High-Temperature Paint

If you prefer a coating over a sealant, consider using high-temperature paint designed for ceramics and metals. High-temperature ceramic paints can be used for additional decoration and protection.

Alternative Sealants

For those looking for more specialized sealants, here are a couple of options:

SystemThree Clear Coat

A 2:1 AB epoxy that is low viscosity and can penetrate deeply into wood and ceramics. Cured after brushing, it is a stable and fairly heat-resistant option. A 12-ounce kit is priced at $33.

Sodium Silicate Solution

Known as "water glass," it can be used as an unfired silica glaze when brushed onto surfaces. When left to cure, it doesn't soak or burn off. A quart of 40 solution is available for $20 on Amazon.

Both sodium silicate and SystemThree Clear Coat have strong properties and can be hazardous if not handled carefully. Follow the manufacturer's instructions for best results.

DIY Varnish Alternative

For a cheaper option, consider using artist's acrylic varnish:

These cans are often available for as little as $7 at department stores. Depending on where you spray, you may not see any burn marks if you stub out a cigarette butt in the ashtray.

No matter which sealant you choose, ensure that the air-dry clay is completely dry and cured before applying the sealant. Always follow the manufacturer's instructions for the best results. Experimentation can lead to successful outcomes, so don't be afraid to try different options and approaches. Happy crafting!