Since I rinse my gun under water after cleaning it in a Mpro 7 bath, I put my gun in the oven to dry it. I usually set the oven for 300 F and leave the gun in there for about 20 minutes. I have been told that this could break the sealant on my Meprolight tritium vials and cause my sights to have a shorter lifespan. Does anyone known how much heat the sealant can withstand?