What is a good top coat for a diy tile coaster that is heat resistant?
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I want to make a diy tile coaster using my cricut. I want a top coat that is waterproof and I can put a hot coffee cup on it too. Any suggestions?
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No top coat is 100% waterproof or heat resistant.
Oil based varnish will work great or epoxy reain.
Rustoleum makes a high heat clear enamel spray, which is heat resistant up to 2000 degrees: https://www.rustoleum.com/product-catalog/consumer-brands/auto/specialty-paints/high-heat
I don't know about the heat, but we've used a marine grade varnish on our DIY coasters and they are waterproof.