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Metacrylics® Acrylic BASE Elastomeric Roof Coating

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Description Gray, water-based acrylic elastomeric coating. Non-volatile, highly adhesive coating for almost any surface. Must be protected from the sun's UVs with Metacrylics® reflective acrylic color coat.
Uses For use as a protective coating. When applied with Metacrylics® Primer, Polyester fabric, and reflective Acrylic coatings, this product is recommended for all roofs and decks. Other uses include exterior and below grade waterproofing. Metacrylics® products may be applied to wood, metal, glass, tile, concrete and stucco surfaces.
Color Gray
Temperature Cycling And Penetration

Tests conducted in accordance with the "Acceptance Criteria For Special Roofing Systems" as published by the International Conference of Building Officials (ICBO). Results: PASS. Samples averaged 1.626 before testing. Samples averaged 1.610 after being subjected to the Weatherometer. The change in thickness was less than 1%. Examination of the samples after testing showed no evidence of tearing or cracking of the protective coating.

*Temperature Cycling and Penetration Testing: 25 continuous cycles, each cycle consisted of 1 hour of water exposure at room temperature prior to 6 hours at -40° F, 2 hours at 70° F, 14 hours at 180° F and 1 hour at 70° F. Spray nozzles delivered 6 inches of water per hour at a temperature of 40° F to 60° F. At the conclusion of the 25 cycles, the specimens were examined.

Flash Point No flash at 200°F (water-based). ASTM 1310, Tag Open Cup
Flexibility Low Temperature Flexibility: pass 1": -40° F ASTM C836
Tensile *Includes M stitchbonded polyester fabric (10 mils).
Strength: 156 psi (81 mils*); Strength at break 1,914 psi 74° F ASTM D412 (10 mils); Elongation:149% ave(81 mils*); Strength at break 3,540 psi, 0° F ASTM D412
Hardness Shore A 41 ASTM D-676 (8 days cure + 4 hours 120o F)
Peel Adhesion Concrete: 6.3 average lbs./linear inch ASTM C836
Permeability (Water Vapor Transmission) 0.016 Perms ASTM D1653 (81 mils dry film thickness)
Wind Uplift 105 PSF Section 6 of ANSI A58.1, Min. Design Loads for Building and Other Structures
Fire Resistance Class A ASTM E-108 UL Standard 790 (1,400° F Flame and Wind Velocity 1,050 ft./minute)
Chemical Resistance
  • Gasoline - some softening and spotting
  • Lubricating Oil - some spotting
  • 1% Sodium hydroxide alkali - no effect
  • Diesel - no effect
  • 1% Hydrochloric acid - no effect
  • Stoklard solvent - no effect
  • Sodium chloride (salt) - no effect
  • Boric acid - no effect
  • Petroleum ether (naptha) - no effect
Saybolt Furol At 122° F is 265 Sec. AASHTOT 59
Demulsibility No reaction AASHTOT 59
Particle Charge Negative
Toxicity Not for use with potable water
Weight 12.1 lbs./gallon
VOC (Volatile Organic Content) 11.73 g/liter
Solids Content (by weight) 67.9%

Surface Preparation: Surfaces should be clean, dry, free of dust, dirt and oily residues. Remove loose rust from metal, and wipe new galvanized metal with acidic acid solution prior to application. Metacrylics® Primer is recommended for all surfaces. New concrete must be fully cured. New glazed asphalt and torch down single-ply assemblies should wait 6 months or more before application.

Spray Application and Coverage Rates: Apply Base @ 3 gallons/100 sq. ft., embed polyester fabric, then immediately apply Base @ 2 gallons/100 sq. ft. over the polyester fabric (total 5 gallons/100 sq.ft.), using a .061 spray tip. Allow 24 to 48 hours drying time. *Hints: DON'T SPRAY on windy days! Use barricades around the job. Visqueen all skylights, etc., not to be coated. Be sure to have 1/2 a barrel of water to flush the pump and hose when finished, as well as extra tips and TSL Throat Seal Liquid. Carefully pour a 1/4" layer of water over the drum of Base to prevent skinning over.

Roller Application and Coverage Rates: Apply Base @ 3 gallons/100 sq. ft., embed polyester fabric, and then immediately apply Base @ 2 gallons/100 sq. ft. over the polyester fabric (total 5 gallons/100 sq.ft.). Allow 24 to 48 drying time. Overlap sidelaps and endlaps 3". Use a 9" semi-rough surface roller cover for application of the Base and polyester fabric.

Hints: Allow 24 to 48 hours drying time or dry enough to walk on. Cold temperatures slow down drying time. Start early, stop early! Application in hot temperatures should be avoided or blistering of the coating may occur. If any Acrylic Base is left over, apply additional coats until all product is used. Five gallons per 100 sq. ft. is necessary to prevent delamination in ponding areas and to maintain superior performance under UV and freezing conditions.

Clean-Up: Clean tools and equipment with water. Cured material may be removed with Amylacetate, hand cleaner, or lacquer thinner. Do not use these materials (except hand cleaner) on bare skin. Thin with water if necessary.

Storage: Store in areas where temperature remains above 40°F. Prior to use, agitate for 2-3 minutes by hand or machine. Reseal opened containers. If contents skin, remove skin, agitate, and use immediately. If the product has been stored for a months (or years), remove any surface skin that may have developed, stir, and immediately use.

Important Application Information

Do not apply if rain or freezing weather is imminent within 24 hours following application, or during fog or drizzle. This product is water-based and could wash off if not fully cured.

Keep Away From Children.

Do not apply when temperatures are consistently below 40° F. The Acrylic Base dries slowly when temperatures are below 55° F. Areas shaded from sunlight dry very slowly. Seventy-two hours or more may be required for proper curing. Do not thin or add solvents. Protect materials from freezing AND extreme heat.

Caution! Wet acrylic is extremely slippery when stepped on. Always use a safety rope on sloped surfaces.

Stir the Metacrylics® Primer before any application! The Base AND Acrylic Colors normally don't need to be stirred before application. Do not stir the Gel.


Metacrylics® products must be applied and installed according to written specifications from the manufacturer. Metacrylics® assumes no liability for failures of this roof/deck system resulting from deviation from manufacturer's written specification, poor workmanship, or delamination of an existing underlying roof/deck membrane. The manufacturer makes no warranty of any kind, express or implied, concerning this roof/deck system, if it is not used according to manufacturer's specifications.

Manufacturer: Metacrylics®, 365 Obata Court, Gilroy, CA 95020 Office: (408) 280-7733 fax: (408) 280-6329

Sources for the Information Presented Above Are: ASTM and FTMS performed by Underwriters Laboratories, Inc., Cal Coast Laboratories, Inc., Harlan Associates, Inc., State of Calif. Dept. of Transportation (Division of Structures and Engineering Services) Office of Transportation Laboratory, Sacramento, CA; State of Calif. Air Resources Board, Sacramento, CA; State of Calif. Dept. of Health; State of Calif. Bay Area Air Pollution Control Dist.; field experience of construction contractors and California Builder & Engineer. Metacrylics® is not responsible for any changes in the above data due to discovered data or changes in the above tests.