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We used this on our cills and stonework.
It does work but its a messy old job. You trowel on a thick layer then wrap it in the paper covering. Leave that for 24 hours and in theory it should peel off with the old paint attached, in reality you need to do this several times depending on the thickness of paint. You also need to wash it all off and use a PH agent to neutralise the acid, so its gets everywhere.
motman
ectoplasmosis
That sounds like it'd be beyond our budget/capacity right now. Hoping for something that can be applied like a poultice, left to do its thing, then scraped off with minimal effort...