C.G.Edwards & Co.Inc.

272 Dorchester Ave, P.O.Box 358
Boston, MA 02127
Phone: (617)268-4111-4112 * Fax:617-268-8845
E-mail: websales@cgedwards.com

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Dimetcote 9H quick reference

Components 3
Curing mechanismSolvent release and reaction with atmospheric moisture
Dry film thickness
(per coat)
2.5-4mils (63-100 microns)
Theoretical coverageft²/galm²/L
1 mil (25 microns) 128331.5
3 mils (75 microns) 42710.5

Application Data
Mixing ratioas packaged
Pot Life (hours)°F/°C
Environmental Conditions
Air0-120-18 - 49
Surface0-130-18 - 54
Relative Humidity50-90%
Surface temperatures must be at least 5°F (3°C) above dew point to prevent condensation. At freezing temperatures, surface must be free of ice.
Drying time (ASTM D1640) & 3 mils @ 50-90% RH °F/°C
Touch (minutes)51530
Through (minutes)102040
Topcoat (hours)162436
ThinnerAmercoat 65, 101
Equipment CleanerAmercoat 12 or thinner

Application Procedure
Powder and liquid are packaged in the correct proportions which, when mixed together, yield 0.68 gallon or 3.4 gallons of Dimetcote 9H.
1.Flush all equipment with thinner or Amercoat 12 cleaner to remove any moisture that may be present. Moisture can cause hardening of coating in equipment.
2.Stir liquid with an explosion-proof power mixer.
3.Discard desiccant bag from powder can and gradually stir powder into liquid. Continue stirring until powder is well dispersed, and uniformly blended to a workable consistency.
4.Add activator slowly and continuemixing for 2 minutes, making sure the activator is completely incorporated. For more rapid cure to service on certain projects, it is acceptable to mix 2 units of activator per kit with written approval from PPG PMC technical service.
5.Strain material through 30 mesh screen to remove undispersed material and prevent possible clogging of equipment.
6.Pot life is limited and shortened by high temperatures; do not mix more coating than will be used within the specified times.
Important - At the end of the pot life, "kick-out" or separation of liquid and solids occur, together with gassing. Do not keep mixed material which has exceeded the pot life in tightly closed containers as gassing can create enough pressure to cause containers to burst. Cover containers loosely.
7.Keep containers loosely covered during use to prevent skinning or gelling due to moisture in air. Skim off skins and strain material through cheesecloth or 30 mesh screen to remove any remaining skin pieces. Discard gelled material.
8.Thin for workability orwhen a rough filmor 'dry spray' is obtained because of fast solvent evaporation during hot weather or highwind. Use 2 oz. of Amercoat 101 per gallon of mixed coating. For low temperatures (60°F) or below or when experiencing slow drying, use 2 oz. of Amercoat 65 per gallon of mixed coating.
9.Adjust spray equipment to apply an even wet coat with minimize over spray.
10.Continue very slow stirring during application to maintain uniformity of material. Avoid fast stirring as this may cause a rise in material temperature and moisture entrainment shortening pot life and causing gelling.
11.Apply in even, parallel passes, overlap each pass 50 percent. Pay special attention to welds, cut-outs, sharp edges, rivets, bolts, etc., to insure proper thickness. Keep pressure pot at approximately the same elevation as spray gun for proper material delivery to gun.
12.Prevent contact with water until the freshly applied coating is dry to touch.
13.When dry through, check film thickness with a nondestructive dry film thickness gauge. Recoat if greater thickness is required. Normal recommended thickness is 3-4 mils (75-100 microns). Total dry film thickness must not exceed 8 mils (200 microns). Greater thickness may develop cracking
14.Random pinholes, holidays and small damaged or bare areas can be touched up by brush when film is dry to touch. Larger areas should be resprayed.
Note - Drying and topcoating times will be longer when film thickness is over 4 mils (100 microns), ventilation and air movement are restricted and temperatures or relative humidities are lower. A water mist sprayed over the coating when the film is dry to touch will accelerate harding hadening at lower humidities.
15.In confined areas, ventilate with clean air during application and drying until all solvents are removed. Temperature and relative humidity of the air must be such that moisture will not condense on the surface until after material is dry to touch.
16.Clean equipment with thinner or Amercoat 12 cleaner immediately after use or at least at the end of each working day or shift. Clean spray guns more often during hot weather. When left in equipment, Amercoat 9HC will harden and plug spray equipment.

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