Can you use mesh tape on inside drywall corners or should I use paper? Is it a matter of preference or are there some rules that are generally followed?
Drywall – Inside drywall corners-mesh vs paper
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Related Solutions
I've had decent luck not taping inside corners at all. Instead I've use a sanded caulk. The key is to have a nice sharp edge to work with where the two pieces of sheetrock meet.
But if you want to mud and tape, there are tools for that:
They come in various angles, but most can adjust the angle merely by angling the handle yourself.
Use scrim tape on both 90 degree and non-90 degree internal corners. I've never had a problem with it in internal corners, though I don't do much plastering.
You can use skim beads on non-90 degree external corners; it might help to squash them out to open further and better fit the profile of the corner.
Don't forget to scrim tape the straight board joints too in order to help prevent cracking in the future.
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Best Answer
Can you use mesh tape on inside drywall corners or should I use paper?
Paper only - mesh is designed to be used flat, in joints that primarily expand - not to be folded in a corner, where the joint can freely move in all directions.
Is it a matter of preference or are there some rules that are generally followed?
Rules/Experience - manufacturers recommendations and common sense to anyone with a minimal amount of drywall taping experience.
More specifically, mesh tape is intended for joints mainly under expansion loads and does not function well under the compression, bending, or shear loads, that a corner typically adds to a joint. Paper tape has a crease designed into it, for ease of folding and placement within a corner joint. Read the following USG white paper, for more detailed information.
USG - Matching Tapes and Compounds