Flex Guard® Flexible Epoxy

Flex Guard® is a 100% solids flexible urethane/epoxy hybrid. The extreme flexibility of Flex Guard makes it the best solution for the most extreme conditions. A 100-150% elongation allows it to be applied where other coatings fail.


Flex Guard® is a 100% Solids Flexible Urethane/Epoxy hybrid. The extreme Flexibility of Flex Guard makes it the best solution for the most extreme conditions. A 100-150% elongation allows it to be applied where other coatings fail.

Flex Guard exhibits excellent adhesion to steel and concrete; providing superior protection for tanks that typically experience freeze thaw and temperature fluctuation.


Flex Guard is available in 5 gallon pails and 55 gallon drums.


Flex Guard will yield theoretical coverage of 12.5 sq. ft per gallon @ 125 mils thickness. Actual surface coverage will depend on substrate porosity and roughness. A wet film thickness gauge may be used to determine actual coating thickness.

Application Systems

Heated Plural Airless Spray Units
Minimum Output 5000 psi
Product Hose: – Optimum I.D. 0.375 – 0.5 inch

Cure Time (at 70°F or 21°C)

Re-coat Window – 24 hours
Light Loading – 12 hours
Immersion (Aqueous) Service – 24 hours
Full Chemical Cure – 7 days

Pot Life

75°F (24°C) 300 minutes

Typical Requirements

With Flex Guard®, only 1 coat is needed to attain finished thickness. If additional coats are called for they must be applied before the previous coat has completely cross-linked, typically for 24 hours @ 72°F (higher temperatures/humidity will shorten this window). If coating after re-coat window, brush blast before applying the next coat. Before reblasting, clean and dry surface thoroughly to remove all contamination, including amine blush or condensation. Small areas may be abraded by sanding or wire brushing.

The same requirements apply when overlapping seams of adjacent coating sections to create a continuous protective film. If the coating surface to be overlapped at the seam cannot be brush blasted, use a non-impact means, such as power brushing or sanding, to create adequate mechanical profile.

Surface Preparation

Coating performance is largely determined by the degree of surface preparation… More is Better.

CONCRETE & MASONRY substrates must be prepared in a manner that provides a uniform, sound, clean, neutralized surface with sufficient profile suitable for the specified coating. The substrate must be free of all contaminants, such as oil, grease, rust, scale or

deposits and have  a surface profile equivalent to a CSP2 to CSP5   in accordance with ICRI Technical Guideline No. 03732. This can generally be achieved by abrasive blasting, shot blasting, high pressure water cleaning, water jetting, acid etch, hot water/steam cleaning or a combination of methods.

STEEL surfaces may require “Solvent Cleaning” (SSPC-SP 1) to remove oil, grease and other soluble contaminants. Chemical contaminants may be removed according to SSPCSP 12/NACE No. 5. Identification of the contaminants, along with their concentrations, may be obtained from laboratory and field tests as described in SSPC-TU 4 “Field Methods for Retrieval and Analysis  of  Soluble Salts on Substrates”. Surfaces to be coated should then be prepared according to SSPC-SP 5/NACE No.1 “White Blast Cleaning” for immersion service or SSPC-SP 10/NACE No. 2. “Near White Blast Cleaning” for all other service. In certain situations, an alternate procedure may be to used such as high (>5,000 psi) or ultrahigh (>10,000 psi) pressure water cleaning or water cleaning with sand injection. The resulting anchor profile shall be 2.5-5.0 mils and be relative to the coating thickness specified.


Quadex® warrants its products to be free of defects in material and workmanship. Within one year from purchase, if any Quadex product is proven defective, Quadex will replace said product or refund its purchase price, at Quadex’s sole discretion. Quadex’s obligation shall be limited solely to such replacement or refund. There are   no other warranties by Quadex, expressed or implied. There is no warranty if Quadex products are used contrary to Quadex’s written directions.