Presumably the answer is just to fill the cracks with more putty and then paint it, but where can you find oil-based black gloss?
Hit it with Zinnser BIN then a water based paint will work over the top
Interesting! I've got some of their Bulls Eye 123 in the shed, would that work?
No. Iirc that’s their water based primer.
@ffm started
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Hit it with Zinnser BIN then a water based paint will work over the top