Any time the mud it put on extra thick, it will crack when as it
dries. This is normally not a problem.
Normal, good taping requires 3 coats. Do not expect finish
looking tape joints in the first coat - pros do not get it in one
coat either. The trick is to apply the mud and wipe in the edges
to minimize or eliminate sanding. Each coat is put on with a
wider knife to feather out the edges of the joints. The 3 rd coat
should give you the smooth joints you do seek. If this is your
first time to tape and bed, it may take 4 or 5 trips.
As Christian said, a thermal setting mud like Durabond can be
built heavier without the cracking, but it would usually only be
used for the initial bed coat.
Keep the whole world singing . . . .
DanG (remove the sevens)
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