My apartment has plaster walls with some minor cracks, all of which I've repaired with fiberglass mesh + plaster. I've sanded all repairs, washed/degreased the walls, and primed with Zinsser 123.
Now I'm ready to skim coat; the top coat will be EasySand 90, but I'm not sure what to use for the base skim coat; my options so far:
- Joint Compound, premixed (Greed Lid)
- Durabond OR JC (premixed) + Plaster of Paris (3/1 ratio)
Option 1 is probably the easiest, but premix tends to shrink more than powder. Option 2 avoids that problem, but Durabond is not ideal for skim coat, at least not according to the manufacturer. I like option 3, but plaster cures so fast, unless I work quickly with small batches it will be a mess. I tested 1 TSP of baking soda with 1 CUP of plaster, managed to double curing time, I'm just not sure if using baking soda for a plaster skim coat will stand the test of time.