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Biostrip's the best thing I've found - and it's also the quickest, cheapest and least toxic. You can get a tub of it for about a tenner on Amazon.
Do any of you have any good techniques for stripping paint from plastic and metal models? I've been having trouble finding something that strips the model sufficiently but doesn't damage plastic. Metal models are tougher, obviously, but I haven't found the perfect paint stripper for metal either. Thanks.