I'll be installing new carpet and a trunk kit soon and I wanted to know if I should take the opportunity to put any kind of rust sealant (POR-15 or something else?) down while I have access to the floors. What are everyone's thoughts? I did get mass backing on the carpet and I believe that I have sound deadening I will be installing too. I'm not so worried about the sound/heat issue as making sure that I protect the metal while I have easy access.