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Oh crap. Sounds like it’ll all need to come off.
Careful of the heat gun and the glass (bitter experience)
Those carbide scrapers are great - the Bahco one I have is a favourite tool. BUT they’re brilliant at smashing glass - I managed to shatter a toughened glass double glazed unit I’d just fitted a while ago by just tapping it wrong.
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I used a sheet of something, not sure what, to shield the glass from the gun blast. Still requires care, it’s tedious work and your attention slips. The Bahco carbide scrapers are great. Very satisfying. I tend to use a regular scraper first to lift the thick paint off then scrape back with the Bahco.
It’s bubbling off in thick slices, not sure what it is but there is a noticeable step between where it is and where it has already come off. Almost looks like a plastic coating compared to paint I’m used to.