WC-1 General Description

WC-1 (AP) TM is a version of our general purpose, two-component, solvent-based, Fluorinated Polyurethane (FPU WC-1TM) topcoat that is optimized for UV resistance. It produces an exceptionally hard, slick surface that is easy to clean, and provides exceptional gloss retention.

FPUTM coatings have protective properties that are comperable to baked-on Fluorinated polymers (such as PVDF) but FPUTMhas two advantages. It cross-links as it cures and therefore produces a mechanically tough surface. If cures at ambient temperatures and therefore can be field-applied with standard painting equipment.

When cured, an FPUTM topcoat has a low surface energy (non-stick), is chemically extremely stable (non-reactive), flexible, abrasion resistant, and impermeable to oxygen and water. FPUTM provides exceptional barrier-effect corrosion protection. The surface is easy to clean because its low surface energy produces a super-slick finish that resists soiling. An FPUTM coating has an exceptionally long service life because: (A) its chemical stability allows it to withstand UV, and Heat (B); its flexibility allows it to resist chipping. An FPUTM topcoat greatly enhances an epoxy system's impermeability to water and oxygen, and inhibits chalking by protecting the system from UV radiation. Because it is non-reactive an FPUTM coating is nonpolluting. One FPUTM system is approved in Australia for portable water applications.

WC-1 provides cost effective, general purpose, FPU protection in normal environments that do not have exceptional conditions, such as desert heat, sand storms, graffiti, salt-water immersion, severe off-shore weather conditions, marine fouling, exposure to corrosives or immersion in petroleum, oil, and lubricants. 21st Century Coatings manufactures other products that are optimized for these exceptional conditions. WC-1 (AP) TMTM is not intended for exposure to atmospheric salt water or strong organic solvents. WC-1 can be applied (typically over Epoxy Primers) to a variety of properly prepared surfaces including, Ferrous Metal, Galvanized Metal, Aluminum, Concrete, and Fiberglass.


Vehicle Type Modified Fluorinated Polyurethane
Solids Content ± 2% 68.4% by weight - White 51.1% by volume - White
Coverage (Theoretical) 962 sq ft per gallon 1.0 mil DFT - White
802 sq ft per gallon 1.0 mil DFT - Clear
Coverage (Estimated) 336 sq ft per gallon 2.0 mil DFT - White (30% Loss Factor)
280 sq ft per gallon 2.0 mil DFT - Clear (30%Loss Factor)
Number of Coats One (2.0 mils DFT)
Application Method Airless Spray preferred - Conventional spray acceptable, brush for small areas if necessary
Thinner FUT-102 (Normal) or FUT-130 (Slow)
Clean up solvent MAK, MIAK or MIBK
Shelf Life at 75° F One Year from Data of Manufacture
(Drying time at 75 ° F)
1-1 to 2 hours tack free
18 hours hard
48 hours full cure
Temperature Limits 300° F Intermittent Dry Heat
Flash Point (Seta Flash) 93° F
Color, Gloss White and Clear High Gloss (Most colors available, any gloss)
Pot Life 1 to 2 hours at 70° F (21° C)
Mixing Ratio 4 to 1 by volume (4 parts base / 1 part activator)
VOC Content 2.8 pounds per gallon (White);
3.5 and 2.8 pounds per gallon (Clear)
Shipping Information Approximately 12.25 pounds per gallon including container - White
Approximately 10.0 pounds per gallon including container - Clear

IconSurface Preparation

Good surface preparation and cleaning of the substrate is essential to the performance of the coating system. All the surfaces that are to be coated should be dry, clean, and free of all contaminants.


Abrasive blast for this coating system. The relative humidity must remain below 85%. Apply coatings only when the steel surface temperature is more than 5° F above the dew point temperature of the surrounding air. This 5° F differential is necessary to prevent condensation of moisture on the surface. Apply this coating system only when the temperature of the ambient air and the receiving surface is between 50° F and 90° F. For optimum application properties, the temperature of the stored material should be between 50° F and 80° F prior to mixing and application. Maintain the unmixed material in closed containers in protected storage at 40° F to 100°F and out of direct sunlight or rain.

Ferrous Metal

Abrasive blast steel to SSPC-SP 6 to SSPC-SP 10 "Commercial Blast" to "Near White Metal Blast" with a surface profile of 1.5 to 2 mils (25 to 50 microns). On old or previously finished surfaces the degree of cleaning required prior to blast cleaning is dependent upon the condition of the substrate. Remove oil and prime with Pretreatment (Wash) Primer such as DOD-P-15328D, F-117 or equivalent.

Brush apply one coat of primer (Epoxy Polyamide Primer 21EP150 or equivalent) over welds, corners and crevices.

Apply full coat of primer (21EP150) over entire area to 3.0 mils DFT upon completion of the brushed areas. Apply primer to all areas as soon as possible after blasting but not longer than eight hours. Check dry film thickness. All areas must have a minimum coating of 3.0 mils DFT of primer. Areas with less than 3.0 mils DFT of primer should have an additional coat of primer or intermediate applied. Some specifications will require two (2) coats of primer / intermediate at 2 to 4 mils DFT each to assure proper coverage, with a total DFT of primer / intermediate to be 4 to 8 mils.

Apply the WC-1 Fluorinated Polyurethane at 2.0 to 3.0 mils DFT to obtain a total Dry Film Thickness of the coating system of 5.0 to 8.0 mils.

Galvanized Metal

Remove oil and prime with Pretreatment (Wash) Primer such as DOD-P-15328D, F-117 or equivalent.


Clean thoroughly and etch with phosphoric acid based cleaning solution. Rinse well and allow to dry. Prime with 21EP150 or equivalent.


Must be clean, dry, properly cured and free from all surface contaminants. "Brush off Blast" (SSPC-SP 7) to provide an etched surface and to remove contaminants and laitance. Remove all dust before coating.

Prime with an Acrylic Block Filler, if surface is extremely porous, or with an Acrylic Primer, if relatively smooth. Allow to dry at least 48 hours.

Follow primer with an intermediate coat of Epoxy Polyamide 21EP151 or equivalent prior to finish.


Must be clean, dry, properly cured and free from all surface contaminants. Hand or mechanically sand entire surface until smooth and to remove any gloss.

Solvent wipe surface with MAK, MIBK, MEK or Acetone, turning rag continuously to remove all sanding dust. Repeat if necessary to assure a clean dry surface.

Apply 1 or 2 coats of Epoxy Polyamide primer or intermediate (21EP150 or 21EP151) or equivalent prior to finish.


This is a two component coating supplied in two separate containers: Component A (base) and Component B (activator). Thoroughly mix Component A (base) with mechanical agitation material prior to mixing. Lightly shake Component B (activator) prior to mixing. Pour contents of Component B into Component A while under light agitation and stir well for approximately 3 to 5 minutes prior to application. No induction time is required, just thorough mixing of the materials. The paint should be kept covered at all times after mixing and during application to prevent contamination. Note that this material is moisture sensitive. Any introduction of moisture or water into the material during mixing or application will shorten usable pot life drastically.


This product, when mixed, should be ready to apply. In the field, it should require minimal thinning for application. If thinning is necessary to achieve the desired application viscosity, thin up to approximately 10 percent, maximum, per gallon. Use only the thinners indicated above in the Specification section.

Icon Application

WC-1 is designed for spray application but small areas may be brushed. Use of an airless spray unit, conventional spray or HVLP spray is recommended. No special system for cleaning or repairing is required. Steel surfaces should be abrasive blasted and primed. It is desirable to limit the area blasted to allow the application of the primer coat during the same shift. No longer than eight (8) hours should elapse prior to the application of the prime coat.


This material is for industrial use only. Material Safety Data Sheets will be furnished on all purchases, it is the responsibility of the applicator to be aware of the information contained therein.

Harmful Or Fatal If Swallowed. Harmful And/Or Irritating If Material Or Vapors Are Absorbed Through Skin. Keep Away From Heat, Open Flame And Sparks. Use necessary safety equipment such as air masks, non-sparking tools, ladders, and shoes, explosion proof electrical equipment meeting the National Electric Standards, etc. See MSDS for detailed information. (WC-1) Notice: The technical data contained herein are true and accurate to the best of our knowledge. All products are offer and sold subject to 21st Century Coatings, Inc. 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
Email: johnshammas@gmail.com