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Item # PC-636, PC-636 Low Temperature Curing High Build Epoxy Coating

Poly-Chem PC-636 is a high performing, surface tolerant, two component, high solids, high build amine cured epoxy designed to cure at temperatures down to 25 °F. PC-636 Epoxy is specially modified with a proprietary blend of selective resins, wetting agents and penetrants to provide excellent adhesion and protection of sound, rusty steel surfaces. Depending on the temperature, the fast setting PC-636 can be recoated the same day.

Ideal as a two coat system over marginal prepared surfaces where blasting is impractical or prohibited. PC- 636 Epoxy is also used as a high build primer under a wide variety of epoxy and polyurethane topcoats.

Pot Life
The Pot life of PC-636 is approximately 2 hours at 75 ºF.

1. Low temperature cure to 25 ºF
2. Excellent adhesion to tight rust
3. A high build primer or finish coat
4. Fast Recoating
5. Excellent against "undercutting"
6. Easy to apply, self priming on steel
7. Excellent build to protect sharp edges and crevices
8. Tight film, low permeability
9. Excellent chemical, abrasion and impact resistance
10. Excellent as a coating on concrete
11. Good adhesion to moist substrates
12. Excellent immersion resistance in fresh and salt water.
Dark Gray
Lt. Gray
Med. Gray
Tile Red
FinishSemi Gloss
Volume Solids75% ± 2%
Theoretical Coverage (per gallon at 1.0 DFT.)1203 ft²
Recommended Thickness4 - 7 dry mils at 170-300 sq. ft. per gallon, normally applied at 5 dry mils
Mixing Ratio4:1 by volume. Mix 4 parts Base (Part A) to 1 part Hardener (Part B)
Induction Time15 min
Pot Life2 hours at 75 ºF
Thinning5 - 15% SA-65 Reducer per gallon
ApplicationSpray, brash or roller
Application Temperature25 to 120 ºF
Maximum Dry Service Temperature200 ºF
Recoat Time4 hours at 75 ºF (5 dry mils)
Packaging1 gal. unit
5 gal. units
V.O.C1.79 LBS/gallon
214 GMS/Liter
Chemical Resistance
Excellent resistance against alkalis, salts, fresh or salt water, gasoline and many acids and solvents. PC-636 is recommended for coating in immersion in fresh and salt water, gasoline, diesel fuel and other chemicals.

Ideal for structural steel, tanks, vessels, water towers, cooling towers, equipment, lines and racks, metal buildings, fences, cat-walks, bridges, railings, fire escapes, etc., in chemical processing plants, pulp and paper mills, sewage and waste water treatment facilities, fertilizer plants, petroleum refineries, electric generating stations, coal handling operations, food processing plants, breweries, dairies, dams, locks, marine installations, etc.

Surface Preparation
1. Steel
a. Sandblast - best
Sandblast to a "commercial" (SSPC-SP6-63) or "Near White" (SSPC-SP10-63) blast finish. For best results, prime same day with PC-636 or MCU-100 Aluminum.

b. Power Tool Clean
Follow instructions as outlined in SSPC-SP3 specification.

c. Hand Cleaning
Follow instructions as outlined in SSPC-SP2 specification.

2. Galvanized Steel
a. New
Brush blast per SSPC-SP-7 or prime with VE-180 Vinyl Wash Primer per label instructions

b. Old, Weathered or Rusty
Remove all oil, grease, dirt, rust and other foreign matter. Surface should be clean, dry and free of contaminants. Follow with a Sweep blast to provide an anchor profile. Remove all loose, rust, etc. as outlined above under "steel."

3. Previously Painted Surfaces
Remove all loose, peeling, or blistered paints, and any other surface contaminants. Make sure surface is sound and dry. A test sample of PC-636 Epoxy should be applied to the existing paint to check for compatibility.

4. Concrete
All new concrete must be cured at least 28 days. For on-grade concrete slabs, check that a moisture vapor barrier film has been used. Testing may be necessary. Check for the presence of hardeners or residual forming membrane curing agents. Repair all cracks, bug holes, spalled concrete, voids and expansion joints.

All concrete should be prepared in accordance with the American Concrete Institute (ACI), Steel Structures Painting Council (SSPC) and National Association of Corrosion Engineers (NACE) concrete specifications. Remove all dirt, dust, oil, grease, laitance, efflorescence, loose or unsound concrete, and any chemical contaminants by such methods as high pressure water blast, wet or dry abrasive blast, vacuum shot blast, acid etching and other accepted surface preparation methods. A combination of these methods are normally used. Random pH readings using distilled water should be made to ensure all contaminants have been removed. A final pH reading of 7.0 - 8.5 is acceptable.

Coating System Concrete
The properly sound, cleaned concrete should be primed first with either PC-149, PC-155, or PC-1702 Epoxy Concrete Primer per label instruction. Two coats of PC-636 Epoxy at approximately 4-7 mils dry per coat is recommended tor light traffic areas. For heavy forklift and high abrasion areas, CT-352 Polyester Polyurethane Coating, at 2-3 mils dry film thickness is recommended as the top coat over one coat of PC-636 Epoxy.

Mixing Instructions, Application Procedure & Recoat Time
Mixing Instructions
Stir each component to a uniform consistency, using an explosion proof variable speed drill with a Jiffy Mixer. Make sure any pigment settled to the bottom is incorporated. Do not vary proportions. PC-636 is prepared by mixing 4 parts Base (part A) to 1 part Hardener (Part B) with a power mixer. Allow an induction time of 15 minutes. PC-636 may be thinned up to 15% with SA-65 Thinner.

Application Procedure
When spraying, use a 50% overlapping Crosshatch pattern to minimize the occurrence of pinholes. Do not apply to surfaces below 25 °F or above 120 °F. Do not apply over dew or frost. The surface temperature should be at least 5 °F above the dew point.

Cure Time
Times may be longer for thickness above 5 dry mils. For maximum recoat times contact Gulf Coast Paint Mfg., Inc.. For safety and proper product curing, good ventilation is necessary when painting indoors or in confined areas. Be sure the batch numbers are all the same to provide uniform color. Epoxy coatings may yellow or darken during application and after final cure. PC-636 Hardener will darken with age. This will effect the color but will have no effect on the performance of the product. Heaters that emit carbon dioxide and carbon monoxide can cause the coating to yellow. For maximum interior gloss and color retention apply one (1) coat of PC-270 Polyester Epoxy for a finish coat. For maximum exterior gloss and color retention apply a topcoat of CT-370 polyurethane.

PC-636 is Flammable. Keep away from all sources of ignition during mixing, application and cure. The Hardener (Part B) is also corrosive and can cause eye and skin irritation as well as allergic reactions. The use of goggles, fresh air masks or NIOSH approved respirators, protective skin cream and protective clothing is a recommended standard practice when spraying coatings. Proper ventilation is always required.

This product is sold without warranty as to performance expressed or implied. Users are urged to make their own tests to determine the suitability for their particular conditions.

For Professional use only.
For Industrial use only.
Keep Away from Children.