Most pros still use the paper tape, but the mesh is OK to use where the
panels come together evenly or on a small repair job. Still best to use
paper on corners. Some people make the mistake of putting the mesh on a
flat area and then spred the mud right down to the top of the mesh which
shows easier then paper, but that's the wrong technique.
the difference with paper tape is that that tape needs a light coat of
mud to stick to. The mesh tape can be "pressed" on first....
the only reason to put on tape is to prevent cracking. Building codes
require tape or mesh... Wether the paper and grid tape really make a
difference is to be seen.
if the walls and foundation is built correctly, you wont need tape.
I prefer to use paper tape in corners. Mainly because my knife tends to
vibrate on the mesh. The crease in the paper tape makes for a clean corner.
Paper tape is cheaper. Since I use paper in the corners generally I use
paper everywhere. Mesh may be easier for a beginner. Once the job is
finished I don't think it matters if paper or mesh was used.
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