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Re: How to ID bottom paint
As a guide but probably not a hard rule, if you can rub a white rag (t-shirt or towel) over the paint and it comes off on the cloth, that's soft paint and ablative. If you can't rub it off, that's hard paint.
If you want certainty, you probably have to strip the old paint, or just find something that's compatible "with everything" for your touchups.