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I have found some kind of flimsy, soft black undercoating that scrapes off the well walls. I need to disolve this junk and get on with the cleaning and painting. Does any one have any ideas of a solvent that can disolve this crud? I am sure that it must have been an aftermarket spray-on. While I'm at it, any recomendations on a GOOD undercoating to protect the new floor pans that I had installed? Spray on or brush on?
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Hi neighbor,
Welcome to a fun forum.
There may be some fairly solid paint under the "coating" that is worth saving. Or, it may at least be a solid base for some careful spray can work. I have had good luck with "3M General Purpose Adhesive Cleaner, #08984". Available at auto body supply stores. I have used this to remove thoroughly cured weatherstrip adhesive from painted surfaces. The gunk softened & wiped off without marring the underneath paint. This stuff comes in a squirt spout can, not spray, & is applied & wiped with a rag. If it will take off thoroughly aged 3M weather strip adhesive, which it does, It just may remove poorly applied undercoating.
Another thing that has worked for light coatings & overspray is "Liquid Sandpaper". Available at the same shops. It is normally wiped on, left for a while & wiped off. When I once needed to prep door jambs for paint, same color, I found that a QUICK wipedown with this removed the top oxidized paint layer & left a smooth glossy surface underneath. It renewed the surfaces so well that the jambs didn't need repainting.
If all else fails, lacquer thinner should soften the gunk, "maybe" without removing the underlying paint. Paint stripper would be an undesirable & messy process. I would be inclined to use "Scotchbrite pads" rather than scraping, less repair work on the underlying surfaces.
A somewhat messy, time consuming job, anyway you go about it, but worth the effort.
On the floor pans, I would use "3M Fast'n Firm #08505" paintable sealer on any joints or edges & follow with, primer & paint on top & bottom surfaces. It's personal preference, but I think that undercoating simply covers up later problems & doesn't really protect the metal "that well".
Are you a member of IBCC? There are so many new members lately that I can't keep track of everyone. If not, it would be a good idea to join. If I can be of further help email me at
rusd@velocitus.net
D