Permatex 80645 Low VOC Gasket Remover, 4 oz.

Removed 27 year old MLS head gasket residue from an iron block with ease. You need to let it sit! I forgot about it and let it sit for about 4 hours and I basically wiped away the old head gasket.Won’t turn your head shiny, and areas are still going to be permanently stained from the old gasket, but it’s smooth again and my fingernail doesn’t catch on anything.