I've been sucking up information from all over about finishing wallboard and I've come up with a list of tips for working with wallboard compound:
- Do use the edging pieces on the outside corners
- Start by covering the tape and over several layers and letting it dry in-between gradually feather it out
- Use adhesive plastic mesh tape to join wall board to surrounding wall. This can be used around outlets and pipes as well to help close up holes.
- Using plaster instead of dry-wall compound can be helpful for joining with existing plaster. I've seen no problems at all working with plaster on wallboard.
- Use a damp sponge to help smooth as you are working. Working over plaster the sponge will create a fine grainy texture (this matched our existing plaster wall finish).
- Use a wider blade (8") to smooth the compound, smaller blades are a pain.
- Cover the entire area of wallboard with a skim coat after you have feathered out from the tape joins, it really helps smooth the wall out.
- The smoother it is when you are working with the wet compound the less sanding later. This is totally worth it as plaster dust gets everywhere.
Here are some shots of the wall repair in progress for behind the sink and radiator in the upstairs bathroom.