I planning to paint inside a cupboard in my 1930’s house. It is bare plaster, I’m not sure when it was plastered but I can’t imagine it was within the last 50 years. Can anyone advise what sort of prep I need to do for it?
Bare plaster is usually prepped with a watered down coat of white paint. I'm not sure of the exact ratio but it's usually very watery and transparent. In your case I might just try going straight to paint application as it was so long ago. Leave the door/s open for a while to get it as dry as possible prior to painting. Just do a small test piece first in any left over colour you have lying around. If it adheres well and doesn't flake its fine to paint. If not you will need to prep first as described above.
I agree that a mist coat is needed. It doesn’t have to be white paint but it does have to be at least half water. Bare plaster can absorb all the moisture from paint very quickly and just leave a surface layer of pigment that doesn’t adhere well, cracks and flakes off. That’s why you seal the plaster with a watered down layer. Use emulsion paint and after the mist coat is dry you will need at least two coats of unwatered paint.
I've had good experiences with ScrewFix' NoNonsense bare plaster paint. It's a great low-cost option that didn't require a mist coat. On the other hand, it comes ... as it does. White. No choice there. For anything "tinted" - pretty much irrelevant the brand - go classical.
If you spray (not roller / brush), most paints need to be diluted a little. So start with something like a 1:4 dilute for the mist coat, and then 1:2 or so for the ones giving coverage.
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