USG SHEETROCK Gypsum Panels - Manual (Page 21)

When applying earlier coats,
minor depressions and grooves
were not a problem. However,
do not leave any during the
application of this final coat or
they will mar the finished sur-
face.
19 Third Coat, Outside Corners and
Metal Trim
Allow second coat to dry over-
night. Sand lightly if necessary.
Apply third coat with 10
Љ knife,
feathering slightly beyond sec-
ond coat. A third coat is typically
not required if S
HEETROCK
Brand
Lightweight All Purpose Ready
Mixed Joint Compound (P
LUS
3)
is used.
20 Sanding
Allow third coat to dry overnight.
Lightly sand imperfections in
finished joints, corners and over
fastener heads. Carefully
remove sanding dust with damp
sponge.
Tip
Use a fine-grit sandpaper
wrapped around a block of
wood so you don’t dig into the
joint compound. Avoid roughen-
ing the surface paper when
sanding. If you do roughen it by
accident, repair the damage by
applying a little joint compound
with a 5
Љ knife.
21