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If it's old pine I usually use Zinnser cover stain first. 123 is water based and occasionally you get staining from the bare wood soaking through the primer. Cover stain being oil based doesn't allow this. It's a shame because 123 is also moisture vapour permeable.
The new Zinnser 123 is 123+ (or plus). It's supposed to be more resistant to this kind of staining but I've not had the chance to test it yet.
You could try using a carbide blade scraper.
It depends how hench you are, the knob on top of this one might help but it costs an extra £10, Harris do one from Screwfix for £9. Once you get the technique right you can strip a lot of paint of flat surfaces.
If you're doing mouldings one of these helps :-
If budget is an issue maybe try a butane hot airgun before you spend money on chemical stripper. They are tricky around glass as you can crack it with heat but it's less of a problem than chemical stripper on your skin which seems to happen no matter what.
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Airhead
Thanks, the IR stripper looks great but out of budget unfortunately. That handheld milling machine looks terrifying tbh.
I think I’ll have to go with some nitromors type product and take my time. Once it’s stripped would zinsser 123 be a suitable primer before I put down a finish coat?