How to Seal KERACAST® for a Long-Lasting, Professional Finish

How to Seal KERACAST® for a Long-Lasting, Professional Finish

KERACAST® naturally dries with a beautiful matte finish—but if you want your creations to withstand moisture, wear, and daily use, sealing is essential. Whether you're working with KERACAST® or any other water-to-powder casting material, applying a high-quality sealer enhances both durability and appearance. It’s especially important for functional pieces like coasters, trays, and planters where protection from water and stains makes all the difference.

Why Seal Your KERACAST®?

💧 Protection from Water & Staining
KERACAST® is porous by nature. Sealing your piece helps prevent water rings, dirt buildup, and staining—especially important for items like bathroom accessories, planters, and decorative trays.

✨ Enhanced Finish
KERASEALER provides a smooth, streak-free, and glossy finish without the uneven marks often found with brush-on products. The result is a professional-grade surface that’s both beautiful and functional.

🧼 Easy to Clean
A sealed surface is significantly easier to clean, especially for decor or items that come into contact with wax, water, or dirt.

🕯️ Important Note About Candle Use
KERACAST® is not recommended for use as a candle vessel due to its porous composition and heat sensitivity. While KERA SEALER offers surface protection for many functional applications, it does not render KERACAST® heatproof or fire-safe. For candle-making projects, we recommend using JESIN® instead.

How to Use KERA SEALER

Unlike brush-on sealers, KERASEALER requires a soak-and-cure process for best results.

Fully cure your KERACAST® piece (minimum 24 hours before sealing).
Submerge your item in KERA SEALER for 10 minutes. Ensure the piece is fully immersed and allow the solution to penetrate the surface.
Remove and allow the piece to dry for 24 hours. During this time, the surface will continue to cure.
Optionally polish your piece with a soft cloth after it has fully cured for an extra refined finish and added shine.

Note: Some users have reported temporary water spots that dry without leaving stains. This is common with many water-based sealers and typically does not affect long-term durability.

Final Thoughts from Our Makers

"I use this product to seal my handmade candle jars made from KERAKRAFT, and it is by far the most convenient sealer I’ve tried. The application process is effortless—just soak the item for 10 minutes, and after 24 hours of curing + polishing, the jar is ready to use. It leaves no streaks or marks and gives a beautiful glossy finish!" — Maker Review

If you're working with casting powders or making vessels for candles, this is the seal you can trust.