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It depends on how rough the timber was before it was painted but I'm not having to sand much on the windows I'm stripping. The ancient primer is the toughest bit to get rid of though and it doesn't sand well so I've started going a bit slower and getting everything off more methodically.
Their scrapers are great too, I don't usually get too carried away with tool brands but these guys have really delivered a great product.
Great isn't it :) It looks from the picture like you've got some ancient primer left on the wood there, what are you scraping it with after heating?