our shop is venturing into doing ceramic coating on exhaust etc. my question is around the curing process. i see that you can let them dry and cure the coating with the exhaust heat or bake at 500 degrees for an hour. question is…can you bake them at 400 degrees for say.. 2 hours and cure them. or is it mandatory to reach the 500 degrees mark. we are new to this venture and our oven doesnt go to 500 , appreciate any thoughts and info.