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was in the process of being torn up for replacement at the tine this visit. A proper coating or preservative would have obviated the necessity of replacing this decking. It is, of course, essential to maintain the non-skid properties of the coatings. The present stain seems to be satisfactory in this respect. In the formulation of any new flight deck stains this property should be kept in mind. The use of a greater ratio of pigment to vehicle and possibly a larger particle size inert might give better non-skid characteristics.
3. It may be found that it will be necessary to go to a two coat system to adequately preserve and protect the wood. It may be necessary to apply an oil containing a penetrating thinner which will penetrate down into the fibres of the wood to protect it from moisture penetration when the top coating is ruptured. Oleo-resinous materials tend to bridge and lie on the surface of the wood. An untreated oil might soak down into the cellular structure of the wood and might act as an effective protection. It might be profitable to investigate the possibility of gaining penetration by the use of surface active agents; there are a great many of these agents now available commercially and at reasonable prices. The surface-active agent could be used in one of three ways:
| (a) |
Alone as a penetrant and preservative, |
| (b) |
Jointly with a preservative, and/or, |
| (c) |
As a penetrating constituent of the flight deck stain. |
4. Surface-active agents are legion, and the selection of one agent for this particular work will require careful thought and considerable work. Some of the producers of surface-active agents are listed for convenience. A more complete list can be had by consulting the "Journal of Industrial and Engineering Chemistry" for January, 1941.
American Cyajnamid & Chemical Corporation,
30 Rockefeller Plaza,
New York. New York.
Carbide & Carbon Chemicals Corporation,
30 East 42nd Street,
New York, New York.
Dewey & Alay Chemical Company,
Cambridge B, Massachusetts.
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