PRODUCT NUMBER

PRODUCT NAME

65-7

CLEAR ACRYLIC POLYURETHANE COATING

GENERAL DESCRIPTION

Pruett-Schaffer’s #65-7 Clear Poly-urethane is a two component, air drying, solvent based, aliphatic polyisocyanate cured acrylic coating. It is designed as a heavy duty, premium quality, high gloss, non-yellowing topcoat for use over primed metal substrates.

RECOMMENDED USES

Use to protect machinery, tanks, and structures from corrosion in aggressive environments where chemicals, salt, water, fuels, and oils are present. This coating exhibits good flexibility and resistance to impact cracking, and has excellent exterior weathering resistance and gloss retention. It is not recommended for immersion service.

SURFACE PREPARATION

For severe service, metal substrates should be degreased and blasted to an SSPC-SP-10 white metal blast with a 1.0 +/- .5 mil blast profile, and primed with an epoxy primer, such as Pruett-Schaffer’s 10-Series Epoxy Primer (or equivalent) or an Inorganic Zinc Primer. An SP-6 commercial blast may be sufficient for many repair or DTM applications with less severe requirements. Weathered galvanized metal must be cleaned of rust and oxidation products by sweep blasting or power washing. All surfaces to be coated must be clean, dry, and free of oil and grease, weld spatter, burning slag, over-spray, and dust. Sharp edges should be ground smooth.

MIXING INSTRUCTIONS

Mix 4 parts by volume #65-7 with 1 part 65-B Hardener. Mix at slow speed to avoid entraining air into the paint, box the containers while mixing. Use at once, there is no induction time.

THINNING

Thin if necessary for spraying with xylol or methyl isobutyl ketone. Add a little solvent at a time to the mixed system with constant gentle agitation to a maximum of 5% by volume.

APPLICATION EQUIPMENT

May be applied by air assisted or airless spray. Airless spray gives the best results, use .015-.020 inch tip size. Apply at 3 mils wet film thickness to yield 1.5 mils dry film thickness. Best results are obtained from films of 1-2 dry mils, films thicker than 2 mils may bubble. Apply when air and substrate temperatures are between 50-110 ⁰F.

CURE TIMES & TEMPERATURES

Cures set-to-touch in .5 to 1.5 hours at 75 ⁰F, cures to handle in 24 hours. Although recoating is not normally necessary if applied over a primer, this coating may be touched up or recoated. The recoat window is 8 to 48 hours; waiting longer may result in reduced adhesion of the second coat. Allow 7-10 days cure at 75 ⁰F before placing into severe service, longer cure times may be necessary if the ambient temperature is significantly lower.

CLEANUP

Clean equipment with xylol or methyl- isobutyl ketone before the film cures.

ENVIRONMENTAL

This product contains no lead, chromate, or zinc.

PHYSICAL PARAMETERS

VOC, ASTM D-3960:

3.22 lb/gal mixed system

WEIGHT PER GALLON, ASTM D-1475:

8.22 lbs mixed system

NONVOLATILE, mixed system:

By weight: 50.9 ± 2.0 %

By volume: 43.1 ± 1.0%

THEORETICAL COVERAGE:

691 ft²/gallon/mil, dry film

VISCOSITY, mixed system, ASTM D-562:

60 -70 Krebs Units

MIX RATIO, by volume:

4 parts 65-7-A to 1 part 65-B

POT LIFE, mixed in 5 gal lots:

6-8 hrs @ 75 ⁰F. 4 hrs @ 90 °F.

FLASH POINT, TAG CC: 45 ⁰F

INITIAL GLOSS, 60⁰, ASTM D-523: 90+

IMPACT RESISTANCE, ASTM D-2794: Direct: 160 in-lbs Reverse: 160 in-lbs

ADHESION, ASTM D-3359: 5B, no flaking

SALT SPRAY RESISTANCE: 96 hrs, no rust

HEAT STABILITY: No degradation or color shift @ 250 °F continuous