When heating vinyl kits in the oven, be sure that the oven is not hotter than 100° C / 212° Fahrenheit. The vinyl (all vinyl types) can't stand the heat and can tear or blister. This is then no reason for complaint! Please bake kits outdoors, not in confined spaces, as toxic fumes may form when vinyl is heated with the colors. Use only stoves that are not needed for food production!