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What prep did people do?
Is the paint peeling or bubbling?
If not, I would just rub it down with 120 and undercoat.
Especially if it’s an old door that’s never been stripped, those old paints stick like shit, and form a great base layer and are full of yukky stuff that’s best not disturbed.
I still use oil based undercoat mostly - unless it’s a system microporous paint, but then you’ll need to strip down to bare wood.
😖If the paint is lifting give it a good scrape and get off anything loose.
If it’s particularly bad you’ll have to make an executive decision as to whether it all needs to come off.
I’ll look into superdec then! What prep did people do? I’d like to leave the door in place if possible (it’s massive) and I have a knockoff speed heater and a carbide scraper. There is a bit of beading around glass panes but it’s not very fancy.