I have an abundance of products to choose from at little to no cost to me that I can use for my frame, underbody, and engine compartment. Products such as http://ppgamercoatus.ppgpmc.com/prod...f/2_PDS_AI.pdf are industrial coatings that have all the characteristics needed in a coating to withstand rock chips and damp driving. Including salt water. I am pretty sure the coating in the link above will do great but it has a heat resistance of 200deg. continuous, and up to 425 continuous heat exposure with a glass flake additive. My question is would the standard 200degree exposure resistance be fine for under the hood?