MATERIALS :

Plasters (in order of hardness) :
USG Moulding Plaster
USG White Art Plaster
USG No.1 Casting Plaster
USG Hydrocal Cement

For scratch and brown coats :
USG Red-Top Gypsum Plaster
Clean and washed Sand

For white coats and skim coats :
Autoclaved Finish Lime
Gauging Plaster
DuraBond Easysand 90

For bonding agents :
Thoro Thorobond

PROCEDURE FOR CAST RUN PLASTER REPAIR

1. Equipment :

a. Template Knife

Made from sheets of metal, cut full-scale to required shapes and then used to screed or form gypsum plaster to desired shapes and contours. Thickness of brass, aluminum, galvanized or stainless steel used for the template knife depends upon the gypsum plaster used or the amount of time that the template will be stored for future use.

For Hydrocal Cement, .051" brass is recommended. For all others, 26 gauge galvanized metal or stainless steel.

The metal sheet is prepared for scribing by coating it with layout dye (obtained from pattern makers supply houses), and let to dry.

A notch is cut through the original pattern. The metal sheet is placed into this notch and is scribed with a sharp instrument by following the contour of the original pattern, including approximately one inch below and one inch above (for the wall and ceiling lines).

If the original pattern has been removed, place the sheet metal against the pattern and scribe, including an inch for the wall and ceiling lines.

When the knife has been scribed, cut out the unusable areas and file to remove any roughness or imperfections that might be transferred to the finished work. To polish the knife, for a gouge free run, briskly rub a nail over the cutting edge.