How to make Easycast resin coasters heat resistant? Tagged: resin-troubleshooting This topic has 1 reply, 2 voices, and was last updated 6 years, 8 months ago by Katherine Swift. Viewing 1 reply thread Author Posts March 27, 2018 at 3:38 pm #12836 Mrs.BadiGuest My easy cast resin coasters are not heat resistant. When I place a mug of warm coffee it makes tiny cup edge marks on it. How do I fix it. Can I coat it with something to make it heat resistant. Thanks in advance March 28, 2018 at 3:46 pm #12840 Katherine SwiftKeymaster Even when fully cured, EasyCast resin can be soft. I’m afraid you are going to have to switch to another resin. The Resin Obsession super clear resin works well in molds and is heat resistant. You can buy it in several sizes here: https://shop.resinobsession.com/collections/resin/resin-obsession-super-clear-resin Author Posts Viewing 1 reply thread The topic ‘How to make Easycast resin coasters heat resistant?’ is closed to new replies.