BigB98
There is a product that Wurth used to sell, and I think Lawson has it also, I think they call it chip quard or body schutz , used a lot on rockers and then painted over. It remains pliable but I have only seen it in black, and it requires a special gun to apply, (about $60), tough stuff and it can be applied pretty heavily. It also has some sound deadening properties as well.
Cheers
Phil