Dust-waterproofing coils

[johnnycat]

I have used silicone to dustproof my coils and it works pretty good. I was wondering. We all know about the stuff that is sprayed to line pickup beds. Most all parts stores sell a similar version in a spray can. I have used it to undercoat the fenderwells of my truck's for years, it's pretty durable. It sprays out heavy and rubbery. Has anyone used this stuff to dust-water proof a coil?