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Help! I have removed 2 coats of paint from some old doors (1964) using Circa 1850 Furniture Stripper, it worked great. However, I have reached some type of white primer or paint that Circa 1850 can’t touch. I am assuming it’s a polyurethane based paint or primer but not sure.

Has anyone run into this “bullet-proof” primer/paint? Any stripper suggestions that will not ruin the wood?

Thanks