I am installing new moulding (aka baseboards, woodwork, etc). A few of the walls sort of dip inward, so a gap is left in between the moulding and drywall. What's a good material for patching this gap? Would ordinary spackle do the trick or is there a better alternative? It has to be something I can paint over.
This is a simple job for caulk. Just get a tube, run a bead, and smooth with your finger. Allow to dry, and paint it the same color as the baseboard. If the space is wide enough, first try to close the gap by nailing the moulding into the closest stud. If the caulk shrinks too much, after it dries you can run another bead on top.
Note that spackle would crack when the baseboard moves.
paintable caulk. Spackle will crack eventually.