You don't have to, but sanding the edges of the drywall mud will smooth it out so it looks better when painted. Prime the drywall too before painting. You might also consider mudding the drywall to a level 4 finish before painting. Level 4 will make the garage walls look as good as your interior walls. But if the appearance of the garage walls isn't that important, painting over a level 2 finish will look better than seeing bare drywall, but it looks unfinished. You'll see the drywall tape through the paint.
We recently started to paint our kitchen cabinets. We cleaned and sanded them first then applied 2 coats of b.i.n shellac base sanding in between coats. Last night applied one coat of oil-based, semi-gloss enamel and this morning is still tacky I'm assuming from not dry yet, but it has a really textured finish look anyway. How should I fix this tacky enamel before applying the second coat?
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