On my chasis there is light rust pitting. Someone sprayed primer over it so do not know if the rust was treated. I want to remove the primer chemically and then use your fast etch or rust coverter to trap the rust. Then I want to use body filler to smooth the pitting. So is there a chemical mismatch problem with a paint stripper vs your two products and why would I use fast etch versus rust converter? Is there a paint stripperyou can recommend that is friendlty residue to the fast etch or rust converter? I assume once the fast etch o rrust converter is applied the typical bondo will adhere or should I apply some sort ofbuffer coat? Thank you.