1) Yes, but you need multiple coats to build and feather.i have never repaired a plaster wall or ceiling personally. I remember my boss installed sheet rock on a remodel(demo) right next to plaster and then skim coated a few times. However, I didnt get to see the finished product. I dont know how the wall looked once painted.
Is that improper? I have never worked with plaster, so I could use some help on what my options are.
1)Chunk missing from plaster. Can i skim it with joint compond?
2)Patch needed in plaster. Can I use sheetrock and skim.
3)How will primer and paint blend transition from plaster to joint compound?
2) Yes, but I prefer patching plaster. And if it's down to the lath and large enough, I will use Structolite and a veneer plaster plaster.
3) sometimes the transition from JC to plaster will flash because of the porosity of JC.
A great ability is to learn how to patch and blend plaster properly. Something I always wanted to learn, but only recently have somewhat "mastered". Veneer plaster does not want to adhere to old base coat plaster - there is no tooth. There are bonding agents that allow new veneer plaster to adhere correctly. I learned that the hard way many years ago patching the skim coat in a bathroom.
If you ever have an opportunity to learn plaster repairs from a master plasterer, jump at the chance.