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Polynt Composites’ ArmorFlex® 953 Series gel coats are high performance products formulated for the fiberglass industry. They are primarily formulated for marine and sanitary applications,but should be used in any application where water and chemical resistance are needed. ArmorFlex® 953 Series also have exceptional gloss and buffing characteristics. While offering these benefits,the ArmorFlex® 953 Series gel coats have retained the important construction application qualities expected from Polynt Composites gel coats,such as resistance to porosity,tearing,and color separation; sag resistance; consistent liquid properties; excellent patchability; and more. These all add up to higher quality appeal in FRP parts made from Polynt’s ArmorFlex® HIGH GLOSS BUFFBACK® gel coats. ArmorFlex® 953 Series gel coats have enabled customers to meet and surpass all requirements of the American National Standard for plastic bathtubs,shower receptors and shower stalls,ANSI Z124.1,.2 and .3 –1995,Sec. 6.1.1. Gel coats in the 953 Series require only the addition of the proper amount of the appropriate methyl ethyl ketone peroxide to cure. ArmorFlex® HIGH GLOSS BUFFBACK® gel coats are available in the same wide range of colors as other POLYCOR® gel coats. Refer to Polynt’s POLYCOR® Color Card for color selection. Standard base white ArmorFlex® is 953WJ340.

FunctionsSurface Finish

End UsesPipes, Tanks


FeaturesChemical Resistance, Chemical Resistant

Technical Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Composite Materials Functions

Features & Benefits

Materials Features
Product Highlights
  • Excellent water resistance for reduced osmotic blistering
  • Good chemical resistance for long, lasting durable finishes
  • Easier, quicker gloss recovery (less buffing time to achieve gloss)
  • Higher gloss recovery when polishing back aged or exposed gel coat surfaces
  • Higher gloss in patches and surrounding refinished area
  • Higher gloss recoverability from lower gloss molds

Applications & Uses

Composites End Use
Recommended Applications

ArmorFlex® 953 Series gel coats must be mixed prior to use. This includes prior to production spray application and when obtaining material for patching or any material that has been set aside for patching. Several suitable types of mixing equipment and styles of agitators are available for both pails and drums. Regardless of the specific type used, the equipment must have sufficient horsepower (relative to container size) to achieve thorough circulation from top to bottom and out to the sides of the container. The agitator must be properly sized for the container and must allow for uniform mixing regardless of the liquid level in the container. Mixing once a day for 10 minutes is typically sufficient. Do not overmix ArmorFlex® 99F gel coats. Overmixing can break down the polymer coating viscosity increasing the tendency to sag. Overmixing can also result in styrene loss which could contribute to porosity. Air bubbling should not be used for mixing. It is not effective and only serves as a potential source of water or oil contamination. ArmorFlex® 953 Series gel coats are formulated for spray application. Brushing or rolling is not recommended. Refer to Polynt’s Composites Applications Guide for additional information.


Typical Properties
ValueUnitsTest Method / Conditions
Sag ResistanceGood at 20 mils
Thixotropic Index (2/20)5.5-7.0
Flash Point79-82°F
Volatile Organic Compound36.0-40.0%
Weight per Gallon9.0-11.0lbs
Gel Time13.0-17.0minutes
Lay-up Time45-80minutes
Hide (Most Formulations)3 to 20mils wet

Technical Details & Test Data


It is recommended that gel time be checked in the customer's plant because age, temperature, humidity and catalyst will produce varied gel times. All data referencing gel or cure refers specifically to Arkema Luperox® DDM-9 catalyst. United Initiators Norox® MEKP-9 and Norox® MEKP-9H, AkzoNobel CADOX® L-50a and CADOX® D-50 are expected to yield similar performance. Arkema Luperox® DHD-9, United Initiators Norox® MEKP-925 and Norox® MEKP-925H, and Pergan HP-90 may yield slightly shorter gel and cure times.

The recommended catalyst range is 1.2% to 3.0% with 1.8% at 77°F being ideal. Normally, the gel coat film is ready for lamination in 45 to 80 minutes. This time element is dependent on material temperature, room temperature, humidity, air movement, and catalyst concentration. Note: ArmorFlex® 953 Series films have a tendency to air dry and lay-up times may be deceiving. If lay-up time is checked by the finger method, slight pressure and rubbing should be used.

These products should not be used when temperature conditions are below 60°F, as curing may be adversely affected.

Safety & Health

Product Safety

ArmorFlex® 953 Series gel coats may not be compatible in the liquid state with other gel coats and resins. Spray and pumping equipment should be completely clean before using ArmorFlex® 953 Series products. Do not add any material, other than the recommended methyl ethyl ketone peroxide, to this product without any advice.

Storage & Handling

Handling and Storage

Uncatalyzed, standard cure gel coats have a shelf life of 120 days from date of manufacture when stored at 73°F or below, in a closed, factory-sealed, opaque container, and out of direct sunlight. Fast Cure gel coats (gel time less than 9.0 minutes) have a shelf life of 60 days. The shelf life is cut in half for every 20°F over 73°F. Totes of product can have even shorter shelf life – only 66% of that for drums.