I buy a gallon metal container of WD-40 and the plastic spray bottle that is made for it. Get a soft plastic bristle brush . Spray the WD-40 and let it sit a few minutes , spray it again and use the plastic brush. Keep the brush clean by washing it out with the WD-40 . It will take a while to get all the undercoating off but this will not harm any paint or primer. Any paint daubs or stencils will not go away. Get some plastic scrapers that are not sharp and those will help with the thick crap.. 5 gallons used on my 1970 GS , but it got Archival Elite at BCA Nats.. Some things are worth the effort..lol..
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1971 Boss 351 , 17,000 miles .. 1971 Buick GS455 .. 2003 SVT Cobra .. 1971 GTO .. 1969 Camaro Fathom Green .. 1969 Camaro Hugger Orange .. 1970 Buick GS455 .. 1970 BUICK GS350 .. 1998 SVT Cobra 1900 miles;. 1973 STAGE 1 GS . 1971 Mach 1 351C 4 speed , first car. 1970 Mach 1 428 SCJ . 1970 SS 350 Camaro . 1971 442 ... 1968 Buick GS400 . 2015 Lexus IS 350 F Sport 2021 Badlands Bronco Sport
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