Much like Mr. Sweezy, when I cleaned up the old hardened Ziebart asphalt undercoating in the engine compartment of my Manta, I soaked rags in mineral spirits and covered
the areas I was working on and let it soak in for 20-30 mins and then
scraped the old and now softened asphalt off with scrappers make of
wood and some made of plastic. Worked pretty well.
I also tryed using a hair dryer (I no longer have use for
) but that just make the stuff far too sticky.
I like mineral spirits because it isn't nearly as dangerous or harsh on
your skin if any gets on you and it isn't nearly as bad to breath as many other chemical removers.
Actually, placing ice cubes in a plastic bag and chilling the areas made the
undercoating brittle enough to chip off in thicker areas but was taking too long. Might work with the sound padding too.