GENERAL DESCRIPTION
Pruett-Schaffer’s Sandstone Primer is a fast drying, weldable, solvent based silicone-alkyd paint. It is designed as a brush or spray applied, corrosion preventative metal primer. It is high end
metal primer, having excellent application properties, exterior durability, heat resistance and superior adhesion and flexibility. This product can be used as a primer or a flat topcoat.
RECOMMENDED USES
This coating exhibits exceptional weathering and color retention, among the best for all alkyd paints, and is recommended for use on steel structures, storage tanks, machinery, and buildings where a high performance alkyd finish is required. Because of its long service life but higher initial cost, it is specially recommended for use where surface preparation and repainting is difficult or expensive. This paint has good heat resistance compared to standard alkyds, and will resist discoloration and embrittlement to 400 F. It can be used on motors, machinery, hot pipes, and near furnaces where a standard alkyd would fail quickly.
SURFACE PREPARATION
For best results, substrates should be blasted to SSPC-SP-6 commercial blast with a 1 mil profile, and all rough areas and sharp edges smoothed. Mill scale must be removed for heat resisting applications, otherwise expansion & contraction of the metal could cause it to disbond. This coating
is tolerant of less than perfect surface preparation however, and hand or power
tool preparation such as brushing, sanding or water blasting may be sufficient for many applications. At a minimum for acceptable performance, surfaces to be coated must be clean, dry, free of heavy oil and grease, loose rust and paint, weld spatter, burning slag, dust, and chalk.
THINNING
Under normal conditions no thinning is necessary; if required for proper spraying thin with xylol or toluol. Add a little at a time with constant gentle agitation to a maximum of 5% by volume. In ambient temperatures over 85 F Aromatic 100 or Aromatic 150 may be used if “dry spraying” occurs.
APPLICATION
EQUIPMENT
May be applied by brush or airless spray equipment. Airless spray gives the best results, use .015-.020 inch tip size. Brushes should be of polyester or nylon construction. Apply to 3-6 mils wet film thickness, which yields 1.5-3 mils dry film.
DRYING TIME
Dries tack free in 15-30 minutes, dry to light handling in 1 hour, dry to recoat in 2 hours at 77 F. Force drying ovens may be used, allow 15 minutes minimum for flashoff of solvent before heating.
CLEANUP
Clean equipment with xylol or toluol before the film dries.
ENVIRONMENTAL
This product meets current air pollution regulations regarding hydrocarbon and ozone reactive emissions. It is VOC compliant, and contains no lead, or chromate. Read and understand Material Safety Data Sheet for this product before using.
PHYSICAL PARAMETERS
VOC, ASTM D-3960:3.34 lb/gal
WEIGHT PER GALLON, ASTM D-1475:
12.82 lbs
NONVOLATILE:
By weight: 73.9 +/- 2.0 %
By volume: 49.6 +/- 1.0%
THEORETICAL COVERAGE:
795 ft2/gallon/mil, dry film
INITIAL GLOSS, 60 , ASTM D-523:
1-5
VISCOSITY, ASTM D-562:
65-75 Krebs Units
FLASH POINT, TAG CC: 50 F
TEST DATA
IMPACT, ASTM D-2794:
Direct: > 80 in-lbs Reverse: > 80 in-lbs
ANTISAG INDEX, ASTM D-4400:
>8 mils
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.