Did anyone who knows watch the episode of monster garage where they did an old skool model A pickup in a rust finish ? I would like to know how to do it . I am building a 37 chev pick-up rat rod and I want it to have that crusty rusty look. Is it paint or acid ? They even had a new set of chrome valve cover with that rusty finish painted on so it looked like the chrome had peeled away and the rust underneath was showing. Thanks in advance for any info