Check the listing for details. Air Dry Clay Varnish 200ml Gloss Sealant Scratch Resistant Waterproof Brush. Condition: New. Listed at 27.99 USD. 【Waterproof & Durable】The clay glaze with long-lasting adhesion. It also makes a thoughtful gift for craft enthusiasts. Allow the colors to dry thoroughly, then apply the air-dry clay glaze. The clay glaze requires 24 hours to fully cure.