I painted some coasters with resin and some with acrylic pouring sealed with Rustoleum crystal clear enamel spray (3 coats). I tested them with hot and cold drinks for a week and here are my results! Materials used: Resin coasters: Stone coat Countertops art coat Stone coat Countertops white and teal base tints Stone coat Countertops gold dust, purple mountain and bronze mica powders Acrylic pour coasters: Artists loft flow acrylics Blickrick acrylics Floetrol Water Rustoleum crystal clear ename