Is it on the ceiling?
If so rent a sprayer and use a dryfall paint
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I painted my 30x40 14 foot walls and 4:12 roof after insulation. It took 20 gallon on the ceiling (white) and 15 gallons on the walls (gray). I rented a scissor lift and used my Grace Magnum X5. Took about 6 hours, but I didn’t have to tape anything off as I had the insulation company leave it taped.

