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I recently used Wickes paint stripper, it has lots of terrible reviews for being too weak and not stripping multiple layers of paint but it did a great job of removing a single layer of paint badly sprayed over the original paint (with the aid of a washing up sponge).
https://www.wickes.co.uk/Wickes-Paint+Varnish-Stripper---1L/p/155054
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Dampen a microfibre cloth with pure acetone (ebay 5L £20) and rub the frame down with it. Used judiciously, acetone (ie pure nail polish remover) will remove amateur overpainting but not the original coat. I've had a lot of fun with it over the years. A recent example being a scrappy blue frame which turned out to be a Parkes Lightweight.
Does anybody have any advice for removing a top coat of paint to reveal the old paint underneath?
I have just picked up what is apparently a Gillott Continental (all the frame number decent seem to match the sequence) that has peeling white paint. Under it is a lovely light blue showing through which I want to reveal, but my initial experiment with white spirit and wire wool is just stripping that off too so need another method.