Procedure for thinning and spaying a vinyl material provides strippable film for plaster surfaces. Coating is low-cost, effective seal against moisture and other sources of damage. Coating consists of a mixture of hot-spray vinyl material and 30 to 50 percent by volume of methyl ethyl ketone

Dimino, J. M.

Martin, R. R.

English

NASA Technical Reports Server

December 1970	 Brief 70-10666 
NASA TECH BRIEF 
NASA TechBriefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Inexpensive, Removable Coating for Plaster Tooling 
.
A procedure for thinning and spraying a vinyl 
material, previously used as a "hot melt" coating, 
provides a completely strippable film for plaster sur-
faces. The coating is a low-cost, effective seal against 
moisture and other sources of possible damage to 
large plaster tools that must be stored for long periods. 
Previous low-cost coverings could not be stripped 
completely from the plaster because they would adhere 
in places and cause damage when removed, and ure-
thane coatings and sealed boxes, though satisfactory, 
were too expensive. 
The protective coating is prepared by mixing a 
hot-spray vinyl material with 30% to 50% by volume of 
methyl ethyl ketone. The mold-line surface is cleaned 
and sealed with a lacquer, and the material is sprayed 
on the plaster to a maximum thickness of 1/32 in. 
(four coats), using a standard spray gun. The back of 
the plaster and .anystructuralimemberS areialsocoated. 
After 24-hr curing at room temperature, the plaster is 
completely encapsulated and moisture resistant; and
months of testing have shown that the coating does 
not adhere to the mold line of the plaster. A knife or 
razor is used to cut the coating along the outer pe-
riphery and peel it from the mold-line surface: the 
coating is then easily stripped away. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Manned Spacecraft Center, Code BM7 
Houston, Texas 77058 
Reference: TSP70- 10666 
Patent status: 
No patent action is contemplated by NASA. 
Source: Robert R. Martin and James M. Dimino of 
North American Rockwell Corp. 
under contract to 
Manned Spacecraft Center 
(MSC-15819) 
Category 04,08 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Inexpensive, removable coating for plaster tooling

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