Ray K wrote:
The base molding (two inches high) at an inside corner has about a 1/8"
gap at the inner edge (as though both miter angles are a few degrees
less than 45 degrees). The mitered ends (along with the rest of the
molding) were primed and painted before being nailed in place. What
should I use to fill the gap? The choices are wood filler, caulk, and
spackling compound. The filler will be painted.

Thanks,

Ray

Thanks everyone. No disagreement that paintable caulk is the way to go.

Ray