If there is a large hole through the wall, patching plaster
will not stick. Two methods can be used:
-
Cut a piece of metal plaster lath or heavy screen larger
than the hole.
-
Fasten one or two wire ties to the lath and insert through
the hole.
-
Pull the lath up behind hole and wire to a stick of wood
placed across the hole on the front side of the wall.
-
Moisten the edge of the hole and spread a base coat of
patching plaster to within 1/8" of the finished surface. Roughen the
surface with a stick or nail so the finish coat will stick.
-
After the base layer is dry, remove the stick and clip the
wires close to the surface.
-
Trowel on the finish layer being sure it is flush with the
wall surface.
-
Let it dry well and then paint.
-
If the patched area is large, apply a coat of sizing
before painting.