GCR 42
Epoxy Primer/Sealer
Product Description
GCR 42 is a 100% solids, low viscosity epoxy primer/sealer designed as a moisture tolerant penetrating primer for concrete and carbon steel surfaces. This class product conforms to ASTM-C-881, Type 1, Grade 1, Classes B or C, Title 21 CFR 175.000 USDA requirements, exhibits ease of application, surface tolerance and excellent adhesion. It reduces bubbling and pinholes when top coating with various GCR Flooring and other chemical products.
- Zero VOC
- Low Odor
- Highly Durable
- Excellent Anti-Corrosion Protection
- Excellent Abrasion Resistance
- Excellent Adhesion Properties
- Chemical Resistant
- USDA Compliant
- Meets the Super Compliant VOC Paint List Requirements set Forth by the SCAQMD
Intended Uses:
- Concrete Floors
- Pulp and Paper Mills
- Storage Tank Exterior
- Bridges and Structural Steel
- Industrial and Commercial Facilities
- Manufacturing, Processing and Pharmaceutical Facilities
- Laboratories
Product Characteristics
Resin Type: Cycloaliphatic Amine Cured Novolac Epoxy
Finish: Medium
Colors: Gray, white and clear (844 Colorant System)
VOC: 0 g/L
Flash Point: >196°F
Solids: 100% (weight and volume)
Mix Ratio: Pre-measured kits
Dwell Time: 5 minutes
Reduction: None required - Xylene if necessary, but no more than 10% by volume
Pot Life: 1 hour @ 70°F (1 gallon mixed)
Mils Thickness: 7-14 mils. Do not exceed 20 mils.
Drying Schedule:
| (temp/humidity dependent) | 50°F / 80%RH | 75°F / 50%RH |
|---|---|---|
| To Touch: | 6 hours | 4 hours |
| Tack Free/Re-Coat: | 8 hours | 6 hours |
| Dry Hard: | 24 hours | 24 hours |
Full Cure: 5-7 days Mandatory.
Storage: 12 month shelf life, if stored unopened at 45°F-70°F (re- inspect after 1 year). Keep from freezing or prolonged exposure to sunlight and heat.
Product System Options / Compatibility
| Surface | GCR 1 | GCR 2 | GCR 3 | Chips/Quartz |
|---|---|---|---|---|
| New VCT | Yes | No | Yes | |
| Old/Damaged VCT/VAT | Yes | Yes | Yes | Optional |
| Rubber Flooring | Yes | No | Yes | |
| Concrete | Yes | Yes | Yes | Optional |
| Wood | No | No | Yes | |
| Ceramic Tile (*) | Yes | No | Yes |
(*) Apply test area for adhesion and desired appearance. The above table outlines product compatibility and suggested product use. Uses may vary from application to application. Please contact manufacturer to ensure the appropriate products are being used.
Packaging Information
All kits are pre-measured and shortfilled by weight. Kits yield the published coverage rates but may vary depending on application method and porosity of surface. Testing will establish coverage rates:
Container Size
| Kit Size | Activator | Base | Case Size Qty |
|---|---|---|---|
| Sm Repair | Pint Tin | Pint Tin | 4 |
| Lg Repair | Quart Tin | Quart Tin | 3 |
| 1 Unit | Gallon Tin | Gallon Tin | 2 |
| 4 Unit | 2 Gallon Pail | 5 Gallon Pail | n/a |
This product is classified as Shipping Class 55.
ASTM Test Results
Steel Substrate, preparation per SSPC-SP6:
1 coat GCR 42 Primer, 1 Coat GCR 2 Base Coat
Abrasion: ASTM D4060 (taber)
1000 gr. load, 1000 cycles = 30-70 mg loss
Adhesion: ASTM D4541 = 600 psi, ASTM 2197 = 6 kg
Average Critical Radiant Flux: ASTM E648 = 0.68
Coefficient of Expansion: ASTM E831 = 5.4x10
ASTM C531 = 14x10
Color and Gloss Retention: (gloss @ 60°angle) = >80°
Compressive Strength: ASTM C579 = 8,500 psi
Direct Impact Resistance: ASTM D2794
(direct/reverse) = >150in./lb
Flame Spread: NFPA 101 / ASTM E-84 Class B
Flammability: ASTM D635 = Self-Extinguishing
Flexural Strength: ASTM D790 = 3,800 psi
Hardness: ASTM D3363 = H-2H, ASTM D2240 = 80
Salt Spray: ASTM B117 (2000 hours / metal) = passes
Smoke Emissions: ASTM E662 = Passes
Solvent Resistance: (MEK double rubs) ASTM D4752 = 100
Water Absorption: ASTM C413 = 0.2%, ASTM D570 = 0.04%
Theoretical Coverage Rates
Spread rate is dependent on application method, substrate and anticipated level of use. Below figures are for estimation purposes only. Testing should be completed for accurate figures. Application loss factor is not covered due to surface profile, porosity, application technique, surface irregularities, spillage, climatic conditions or film build:
| Substrate | Sq/Ft per Gallon |
|---|---|
| Concrete and Block | 80-160 |
| Masonry | 200-250 |
| Metal, Steel | 200-250 |
Chemical Resistance
Resistance to fumes, splash and spillage, not immersion (ASTM 3912): Acetic 20%, Acetone, methyl/ethyl/isopropyl alcohol, Aluminum Chloride 60%, Ammonium Hydroxide 30%, Beer, Butyl Acetate, Butyl Cellosolve, Calcium Chloride 50%, Calcium Hydroxide, Calcium Tetrachloride 15%, Carbon Tetrachloride, Cellosolve Acetate, Citric 50%, Ethylene Glycol, Formaldehyde, Gasoline, Glycerine, Hydrochloric 30%, Hydroflouric 10%, Hydrogen Peroxide, Hyjet #3, JPS Jet Fuel, Kerosene, Lactic 20%, MEK, Naptha, Nitrio 20%, Oils-Mineral, Perchloroethylene, Phosphoric Acid, 80%, Potassium Hydroxide 40%, Skydrol 500 A&B, Sodium Chloride, Sodium Hydroxide 40%, Sulfuric 50%, Toluene, Trichlorethylene, Trisodium Phosphate-Sat, Urea, Urine, Xylene
Contact Information
Technical questions or warranty issues, please contact:
GENESIS COATINGS (800) 533-4273