Part of the mission assigned to me by SWMBO is to repair a crack in some wallboard in my living room. This crack happens to be on the ceiling and appears to be at the joint between sheets of drywall.

My house was built in 1941 and it appears that it happened at the change from plaster/lathe to wallboard. There's a good 3/8 to 1/2 inch coat of coarse plaster on top of drywall.

But to my question - I'm going to use fiberglass tape over the crack. But it's the plaster I'll use. Patching plaster seems coarse, would using plaster of paris be a better idea? Plaster of paris is very smooth, it seems like a good thing for a repair like this.

What say you?