Mopoxy ST, 41 Series
General Description

This is a Lead and Chromate free, two-component, high-solids, polyamide epoxy coating designed for high-build application and effective corrosion protection on ferrous metal surfaces where optimum surface preparation may not be feasible. Mopoxy ST, 41 is a multipurpose, direct to metal, surface tolerant coating.

MOPOXY HB, 40 MOPOXY ST offers excellent resistance to fresh and salt water, detergents, and many chemicals. It provides excellent abrasion resistance, excellent adhesion to light rust, and good adhesion to damp surfaces. It is a direct to metal coating that does not require grit blasting. It is heat resistant to 200°F. MOPOXY ST is excellent as an undercoat with various FPUWC topcoat urethanes to extend UV resistance, longevity and performance.

Typical uses include commercial and marine application as a protective maintenance coating on exterior storage tanks, piping, roof decks, water towers, structural steel machinery, plant equipment, marine vessels, offshore structures and other surfaces exposed to humidity, chemicals and corrosive environment.


Vehicle Type Modified Polyamide Epoxy
Solids Content ± 2% 78.4% by weight
65.5% by volume
Coverage (Theoretical) 132 sq ft per gallon, 6.0 mil DFT
Coverage (Estimated) 100 sq ft per gallon, 6.0 mil DFT (25% Loss Factor)
Number of Coats One (6 mils DFT) normally, two if required.
Application Method Conventional or Airless Spray, may be brushed or rolled if desired.
Thinner Mopoxy No. 7537 for spraying
Mopoxy No. 7535 for brushing
Clean up solvent No. 7537, No. 7535, MEK or MIBK
Shelf Life at 75° F One Year from Date of Manufacture, unmixed, stored at 40 - 100°F
(Drying time at 75 ° F)
16 hours - dry hard
5 hours to recoat
(FPU top coat may be applied when Epoxy is dry to handle).
Induction Time 15 minutes at 70°F (See "Mixing" below)
Flash Point (Seta Flash) 95deg;F
Color, Gloss White 41-BK-1, Gray 41-BH-3 (Semigloss)
Pot Life 8 hours at 75°F
Mixing Ratio 1 to 4 by volume
VOC Content 2.36 pounds per gallon (284 grams per liter, calculated)
Shipping Information 31 lbs per 2 gal unit - 1 gal Component A (Base) & 1 gal Component B (Activator)
134 lbs per 10 gal unit (5 gal. Component A (Base) & 5 gal Component B (Activator)
Freight PAINT, Flammable

IconSurface Preparation

Good surface preparation is essential to a satisfactory coating system. Surfaces to be coated should be clean and dry. Remove all oil, grease, mildew or other contamination by solvent or detergent cleaning or other effective means.


Apply in good weather when air and surface temperature are above 50�F and surface temperature is at least 5° F above the dew point. For optimum application properties, material should be between 70° to 100°F prior to mixing and application. Maintain unmixed material in closed containers in protected storage at 40° to 100° F.

Ferrous Metal

Surfaces to be coated should be clean and dry. Remove all oil grease, mildew or other contamination by solvent or detergent cleaning or other effective means. For proper performance, "Commercial Blast Cleaning" (SSPC-SP6) is recommended as minimum. For best performance in critical areas of high moisture, condensation, chemical splash or spillage, etc, surface preparation should be "Near White Blast Cleaning (SSPC-SP10). Blasted surfaces should be coated ASAP after blasting to avoid rusting and contamination of the surface.


This is a two component coating supplied in two containers as a unit. Always mix a complete unit in the proportions supplied. Use a power agitator for each component. Allow a 30 minutes induction time @ 70�Fand remix before application before using the coating. Usable pot life depends on the temperature of the material. Refer to pot life section. Agitate before use, with occasional stirring during use. As pot life expires, sag resistance may be reduced. Do not mix any more materials than can be applied in approximately 1 � hours @ 75�F.


Material is supplied at airless spray viscosity and should not require thinning. If required thin with � to 1 pint of No. 75-37 thinner per gallon if necessary for spray application, No. 7535 for brush application. Add thinner only at a time of mixing. Do not add thinner to thickening material to extend pot life.

Icon Application

Spray application is preferred for proper film built and best performance. Brush application is acceptable for touch up and small areas. Roller application may require special care to prevent bubbling and may require more than one coat to attain proper film thickness. Apply at 10 mils wet film thickness to achieve 6.0 mils DFT, unthinned. In severe cases MOPOXY HB should be applied in two coats to reach a total 16 mils DFT.

Notice - The technical data contained herein are true and accurate to the best of our knowledge. All products are offered and subject to the manufacturer standard conditions of sale. Published technical data and instructions are subject to change without prior notice.


Additional Information

For additional information contact your Distributor or :
21st Century Coatings, Inc.
4701 Willard Ave., #426
Chevy Chase, MD 20815
Tel: (301) 654-0099 Cell: (301) 873-5230