I'm planning on using Master Series Silver on the undercarriage and engine bay. I'm worried about cleanup. They warn about using lacquer thinner to clean panels on their website. For those who've used it what did you use as a cleaner. They recommend thinning with Naphtha to reduce the paint. How bad is cleanup with this? I don't want to ruin my good paint gun. Should I buy a cheep Harbor Freight gun? Also do you think two quarts do the undercarriage and engine bay?