Originally Posted By: JHZR2
So a 10 year old truck with plenty of exposed rust was sprayed in high-wash areas, and its curious why there is still rust?
Rust is like cancer, so Im told. You can cut it out, chemically kill it, but once it starts you must be vigilant and it may always come back.
Id have at least lightly brushed it and then converted with ospho or a similar product. You want to at least passivate the surface. A product like FF can prevent mousture exposure, which stops/slows rust, but on a failed surface, its not definite.
If the surface was solid without rust, a replaceable fluid product, and/or a solid product (waxy) may be used. Solid (undercoating or paints like POR-15) can let water migrate under if damaged. A liquid (FF or oil) overspray can help with this, though and is smart to oromote waxes to sslf-heal, and to impregnate paints.
Any fluid product will creep, and will also wash away if the conditions are right. There are places and uses for each product. For this one, ff on rust doesnt look like the right move...
I'm curious why Fluid Film Flaked off and appeared to trap moisture underneath, making rust worse. Its contrary to what I was expecting. I was expecting the oil/parrafin wax to penetrate and slowly wash off. But I don't expect anything to really stop rust. I'm moving on to Rustoleum Stops Rust Rust Reformer after reading
THIS . Which also states Ospho doesn't work well at all.
Agree for the body I will just cut it out and replace the steel. But if the Frame is bad I'll get rid of it. I just don't think welding Frames is safe.