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Do it
In the right PPE with the right kit and with everything you don’t want paint on masked off, obvs.
Iirc @soul had it done this way at his place.
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Nah - wasn't me.
Did consider as I have a spray gun which I use for wood varnish / fence painting but didn't have the balls to try on interior walls.
I would say that you should look at airless sprayers rather than the cheap things that work for garden fences otherwise the finish will be a bit shit.
Spray painting the internal walls of a house. What's the LFGSS verdict?