Originally Posted By: JHZR2
Originally Posted By: hotwheels
While I, for one, haven't counted the water molecules in rust, I know that rust is highly hygroscopic. Even a minute amount of rust, not matter how well converted, sealed or painted over will continue to eat away on the steel. That's why for a truly lasting repair rust must be cut out. Maybe you will consider me narrow-minded, but empiricism tells me I'm right on this.
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So neither fluid film nor HDMP seals hermetically? That's not good.
hotwheels
While I dont doubt the hygroscopic nature of rust out in the open, the point is that a surface rusted spot (on a fastner in my case) which is coated in these "protective" materials, specificially something like wax which is a permanent layer and builds, still allowed rust. The fastener was under the hood, so not even in direct exposure.
This tells me that the waxy coating still allows moisture to come through. So the waxy coatings are great for helping to shed some/much of the moisture that may drip on a surface, some still can diffuse through, even if just atmospheric humidity...
My search is not for a product that seals and prevents already rusted areas from further rusting. I am looking for a product that seals rust-free, painted surfaces and that prevents water from reaching the paint. I realize that even materials considered waterproof, such as epoxy resin, allow water absorption and diffusion. Going by past experiences, factory-applied wax undercoatings and body cavity wax sealants seem to have worked well. I just unaware of any equivalent consumer product.
hotwheels
