I had a question about using internal frame coating on a new part I want to protect. It is a radiator bracket that has a black coating of some sort over the whole piece. I am concerned that I cannot get to the inside rails of the piece well enough and wanted to know if I could use this to permanently seal the inside? If so, is there any type of prep I need to try to do? if not, is there another product I should try to seal that up before installing?