Undercoat
 

The undercoat of my car is really dirty... in some spots it worn right off... and i was going to re under coat it when i realisd that i can't really get all the crap off under my car... i tryed scrubing it and unding a pressure washer... anyideas? i am thinking my i should just spray the new stuff over it..... but when it comes to my car i have OCD a little so it bugging me the idea of spraying it on the crapy stuff... Anyone have any idea or should i just spray it on...

RE: Undercoat
 

If you spray on some new stuff, make absolutely sure that you have let any moisture dry up BEFORE spraying anything else on. You do not want to trap any moisture behind the rust-proofing.

RE: Undercoat
 

there is a chemical called "Scrubbin bubbles with bleach" its used for bathrooms. That **** works miracles dude......spray it on....let it soak so the oxygen bubbles can do their thing.....then wipe off......its worh a shot for 4$