I have a finished concrete pillar in my living room that I need to be patched and painted.
The pillar has final gypsum and paint on top of concrete. Since the concrete is chipped off I need to use a fast set repair mortar (such as QUIKRETE® FastSet™ Repair Mortar) to repair the concrete.
But I don't know if the gypsum material can be added on top of the repair mortar or not? is there a specific product that I can add on top to prepare the surface for paint?
Best Answer
I would use a setting joint compound (maybe durabond) rather than mud because it's more durable and moisture resistant. It's more time-consuming to sand, however. Either should stick to concrete and both should get a coat of primer before painting. If have old or really glossy concrete, you can prep the surface with a little Muriatic acid to etch the surface and get a better bond, but that shouldn't be necessary for fresh-cured mortar.