PRODUCT NUMBER

PRODUCT NAME

28-99

BLACK FAST DRY WATERBASED CONDUIT COATING

GENERAL DESCRIPTION

Pruett-Schaffer’s #28-99 Black Paint is an air-drying, water reducible alkyd paint. It is designed as a fast drying spray- or dip-applied, gloss, exterior finish coat for metal substrates. The cured film exhibits good flexibility, corrosion resistance, and abrasion resistance,

RECOMMENDED USES

This product is recommended as a maintenance coating for conduit and piping, sheet and tube stock, shelving, axles, bins and tanks. It exhibits good application characteristics and adhesion to a wide variety of substrates including minimally prepared cold rolled steel, castings, forgings, aluminum, and existing coatings. Not recommended for immersion service or for areas subject to temperatures in excess of 300 ^F. The paint is not flammable and has very low toxicity.

SURFACE PREPARATION

Apply over primer (follow primer surface preparation instructions) or direct-to-metal. For best results in DTM service, substrates should be blasted to SSPC-SP-6 minimum, with a 1 mil blast profile. Feather all rough or sharp edges. This coating is very tolerant of less than perfect surface preparation however, so chemical cleaning, water blasting, or even hand or power tool cleaning may be sufficient, depending on the level of service required. At a minimum for acceptable performance, all surfaces to be coated must be clean, dry and free of oil/grease, loose rust/paint, weld spatter, burning

slag, dust, and chalk.

THINNING

Under normal conditions no thinning is necessary or desirable. Thin if necessary for proper spraying with an 80/20 mixture of water/butyl cellosolve (Pruett-Schaffer thinner #98-8937). Add thinner a little at a time with constant gentle agitation to a maximum of 5% by volume.

APPLICATION EQUIPMENT

This paint may be applied by brush, roller, dip tank application, air-assisted or airless spray. Brushes should be of polyester or nylon construction. Use roller covers with ³/₈ to ¹/₄ inch nap. Use spray tips of 0.011-.015 inch. For temporary protection apply .2 -.5 mils DFT. Apply 1 mil dry film thickness if over primer, 1.5 mils dry film thickness for best long term durability if direct-to-metal. When using dip tank application, contact Pruett-Schaffer for further information regarding pH and viscosity maintenance requirements of dip tank.

DRYING TIME

Dries tack free in 15-30 minutes at 77 ^F and 50% Relative Humidity. Light handling may be possible in 45 minutes. High humidity will prolong dry time more so than low temperatures. To speed the dry time good air movement over the work and local exhaust is recommended. Heat lamps or forced warm air will reduce dry time in cold shops.

CLEANUP

Clean equipment with warm water before the film dries. Run butyl cellosolve

through spray guns after cleaning to prevent corrosion of steel parts.

ENVIRONMENTAL

This product meets current air pollution regulations regarding hydrocarbon and ozone reactive emissions. It contains no lead or chromate.

PHYSICAL PARAMETERS

VOC, ASTM D-3960: 2.77 lb/gal

VOC as supplied : .99 lb/gal

WEIGHT PER GALLON, ASTM D-1475:

8.78 lbs/gal

NONVOLATILE:

By weight: 27.6 +/- 2.0 %

By volume: 22.0 +/- 1.0%

THEORETICAL COVERAGE:

352 ft²/gallon/mil, dry film

INITIAL GLOSS, 60^, ASTM D-523:

80+

VISCOSITY, ASTM D-4212:

25-30 seconds # 2 Zahn Cup

pH RANGE, ASTM D-4584:

8.0-9.0

FLASH POINT, PENSKY-MARTINS CC:

>142 ^F

TEST DATA

SALT SPRAY EXPOSURE, ASTM B-117 and D-1654, 5% SOLUTION:

160 hrs rust creepage from scribe: < 1 mm

IMPACT, ASTM D-2794:

Direct: > 80 in-lbs Reverse: > 40 in-lbs

ELONGATION, ASTM D-522:

1/4 in conical mandrel: no cracking or flaking

THIS INFORMATION RESULTS FROM TESTS CONDUCTED IN A LABORATORY UNDER LABORATORY CONDITIONS. DIFFERENT RESULTS MAY BE OBTAINED IN COMMERCIAL USE OF THIS PRODUCT UNDER FACTORY OR FIELD CONDITIONS. PRUETT-SCHAFFER MAKES NO WARRANTY CONCERNING THE SUITABILITY OF THIS PRODUCT FOR THE END USE CONTEMPLATED BY THE BUYER, EXCEPT THAT THE PRODUCT SHALL BE IN COMPLIANCE WITH THE TECHNICAL SPECIFICATIONS PRESENTED HEREIN.