Older house with 1" thick plaster (concrete type) over metal grid.
"Sandy" finish, with what appears to be a color added to the final plaster coating.
Lots of nail holes, a couple of cracks, etc.
Want to fill holes, repair cracks (with tape) and fill a few contours.
Will then prime, and paint with a sand textured latex paint.
The question: What is the best material to use to fill the holes, cracks and contours?