421 WB Gloss FX

421 WB Gloss FX


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421 WB Gloss FX is a high gloss, 40% solids, water-based aliphatic polyurethane with very low odor and multiple uses.

Our 421 WB Gloss FX is an excellent choice as a topcoat for metallic floors, grind and seal floors, and many other interior applications where a low odor, high gloss, abrasion-resistant topcoat is desired.


421 WB Gloss FX is a high gloss, four to one (421) water-based aliphatic polyurethane with excellent color enhancement properties. It features a 45-minute pot life with a 5-6 hour dry time.

421 WB Gloss FX has excellent adhesion and hardness properties as well as abrasion, hot tire, and chemical resistance. 421 WB Gloss FX is low VOC and low odor with multiple uses.

Pot Life 45-50 Minutes
Tack Free 5-6 Hours
Foot Traffic 16-19 Hours
Heavy Traffic 4-6 Days
Re-Coat Window 6-12 Hours
Dry Appearance Clear Glossy Finish
VOC Content Less Than 128 Grams/Liter Mixed


If mixing less than a full kit, mix Part A and Part B separately with a stir stick, low-speed mixer, or vigorously shake containers prior to measuring out the smaller kit to ensure uniform distribution of all ingredients. In a clean mixing container, blend 4 Parts A and 1 Part B using a drill mixer for 2-3 minutes. Avoid creating a vortex in the material which could introduce air and/or moisture content to the mixture. Do not mix more than can be applied within the usable pot life time frame. DO NOT THIN!

Coverage Rates

First Coat – Direct to Concrete: 200 – 300 ft per gallon
Second Coat – Over Existing Coating: 250 – 350 ft per gallon

Coverage rates may vary depending upon surface porosity, texture, application method, and prior coating application. Excessive build-up should be avoided.


Using a brush and/or 3/8″ nap shedless roller, dip and roll the mixed material from a roller pan. 18″ rollers are recommended for any surface to speed up application time and reduce roller marks. Start by placing the wet roller at one corner of an approximate 4′ x 4′ square and roll the material at an angle to the opposite corner applying no pressure to the roller. Spread the material across only that square and immediately back-roll to even out material and roller lines. Adjust the size of your square as needed based on the amount of material being applied with the roller. After finishing the square, move on to the next square using the same technique. While applying keep a wet edge to prevent roller marks. It is recommended to work in sections usually using control joints as dividers to ensure proper application results. Apply the mixed material within the usable pot life time frame. If the material becomes thick while applying and sticking to the roller, stop applying and discard the mixed material. At this point, it has reached the end of the usable pot life. Do not allow to a puddle! Use a brush to remove the excess coating in joints. An airless or HVLP sprayer may also be used.


If possible, recoat within the suggested recoat window located above. Apply additional coats in the same manner as the first coat. Note that higher substrate, air, and material temperatures as well as excessive humidity may greatly reduce the acceptable recoat window of this product. When working in higher temperatures, always recoat as early in the recoat window as possible to avoid failure between coats. If recoating outside the suggested recoat window or beyond 24 hours, sand using a 60-120 grit sanding screen to ensure adequate adhesion between coats. Vacuum dust thoroughly, rinse with clean water, and remove excess water with a wet/dry vacuum or floor scrubber. Allow the surface to dry completely prior to application of the coating. Where applicable and with adequate ventilation, wipe the surface with acetone and a microfiber dust mop. CAUTION: Acetone is extremely flammable! If using acetone follow all safety precautions, make sure no pilot lights, open flames, sources of static electricity, sparks, or extreme heat sources are present. Use the recommended personal protection for acetone.

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