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Reprint from biological bulletin 112:325-329, June 57.

The conditions of two experimental plastic mooring buoys are described after 1 year and after 1 1/2 years of service to the fleet in San Diego Bay. Both were performing very satisfactorily at these times. One buoy with a hand lay-up type of fiberglass-reinforced plastic outer shell showed no apparent deterioration; the other with a spray-up type of fiberglass-reinforced plastic outer shell showed some superficial damage, especially on the top shoulder. The fouling on both buoys was similar in type and amount to that on steel buoys in the same area. (Author), See also Part 1, AD-460 523.

Deterioration of white alkyd marking paint occurred on asphaltic runways at several military airfields in Southern California. Oleoresinous phenolic varnish paint generally gave much better performance at these installations. Better service was also received when all of the slurry seal (both damaged and undamaged) in the area to the painted was removed and replaced before restriping. (Author)

Specially formulated marking paints for striping airfields were field tested. The polyvinyl acetate paint at CBC, Port Hueneme was still in excellent condition 4 years after application. In all cases single-thickness ratings were as good as or better than corresponding double-thickness ratings, especially for the double-thickness alkyd ratings. The polyvinyl acetate paint performed best on the runway at Guam, but the three oleoresinous phenolic varnish paints and one of the two alkyd paints performed slightly better on the roadway. On a runway at NAS, Point Mugu the polyvinyl acetate paint performed the best of the six paints tested. Miscellaneous problems with airfield marking paints at other activities are discussed and solutions presented. Laboratory tested included analyzing water-emulsion paints for possible use as marking paints and developing simple test procedures for identifying alkyd and chlorinated resins in fresh and weathered marking paints. (Author)