Preping walls for paininting!
You can get the paste wet ( use a sponge or even a garden bug sprayer-) let it soak in and soften the paste- scrape the paste off with a 6" mud blade ( and a 4 to clean that off the 6) - then sponge any residue left.
Lightly sand to get any bits off- and then prime with a clear primer called Gardz.
then do any repair needed- prime repair and paint.
It's just that easy!! lol
"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS