Finishing the panels – USG SHEETROCK Gypsum Panels User Manual

Page 20

17 Second Coat, Outside Corners and

Metal Trim

Allow first coat to dry overnight.
Apply second coat with 8

Љ knife,

feathering slightly beyond first
coat.

18 Third Coat, Flat Joints and

Fasteners

Allow second coat to dry
overnight. If necessary, remove
imperfections with knife or
sandpaper. Apply a thin finishing
coat with a 10

Љ knife to the flat

joints and a 5

Љ knife to the fas-

tener heads. Press knife firmly
so joint compound fills depres-
sions but does not significantly
add to thickness. Feather edges
at least 2

Љ beyond second coat.

Tips

Do not sand unless it is
necessary. If you do sand, use
fine-grit sandpaper and be
careful not to scuff the gypsum
panel paper to minimize surface
touch-up requirements. For best
results, compound should be
used as thickly as possible on fill
coats and thinned with water for
finish coats.

Before applying the final coat,
check to see if tapered joints are
level with surface. Hold the 10

blade across the joint, straight
out from the wall. If the blade
can be rocked across the joint,
the joint is crowned. It must be
hidden by feathering the final
coat out as far as possible.

Finishing the Panels