< Fields Coatings & Mastics 100 to 300 Series

Product Information Sheet
M300 RubrMastic
All Weather SEBS Mastic

USES: M300 RubrMastic stops leaks in the rain. It even adheres under water. You can effectively seal around chimneys, vents, pipes, air conditioning equipment, skylights, drains, flashings, and sheet metal. RubrMastic also repairs surface fissures, seals down shingle tabs, stops leaking nail heads, cements laps on roll roofing, and bonds roofing sheets to the deck. RubrMastic is compatible with SEBS, APP, and SBS modified bitumen roofing products and will adhere to most surfaces including roofing, wood, metal, glass, and concrete.

DIRECTIONS: M300 RubrMastic is friendly to apply, even in below freezing, wet conditions. Apply with a broad putty knife. Warm RubrMastic to room temperature for easiest application. Clean gravel, dirt, vegetation, and debris from the application area. Make sure the application surface is smooth, firm, and frost-free. Apply directly from the container without diluting. When applying to a wet surface, trowel and work the RubrMastic onto the surface until a secure bond is achieved. Seal areas exposed to water penetration with RubrMastic. Generously apply a minimum .5" thick layer of RubrMastic over the exposed area. Make 3 layer repair with RubrMastic and PolyWeb over fissures or to reinforce degraded areas. First trowel a generous application of RubrMastic over the application area and beyond the width and length of the PolyWeb you intend to install. Second, lightly trowel the PolyWeb into the RubrMastic. Third, carefully trowel a generous application of RubrMastic over the entire repair, making sure to completely cover the PolyWeb. For severe fissures, apply additional layers of PolyWeb and RubrMastic.

DESCRIPTION: M300 RubrMastic is an all weather SEBS mastic. The many uses for RubrMastic make it one of the most versatile roofing and waterproofing products ever engineered. Select raw materials have been formulated into an all weather asphalt mastic that challenges the laws of physics by actually adhering under water. RubrMastic is a patented breakthrough achieved by Fields in SEBS chemistry. The SEBS rubber in RubrMastic provides maximum elastic performance against thermal shock, the daily expansion and contraction of a roof caused by temperature changes. SEBS rubber polymers are the only ones known to effectively resist the sun's destructive UV rays that attack the roof membrane making it brittle and weak, including membrane ruptures during thermal shock cycles. RubrMastic is your best defense against these attacks. With RubrMastic, your roofing and waterproofing installations will perform much longer. RubrMastic is asbestos free.

SEBS RUBBER: The SEBS rubber in M300 RubrMastic provides greater flexibility, lower moisture permeability, greater fatigue resistance, better weathering durability, greater tensile strength, higher temperature stability, and improved resistance to UV rays, ozone attacks, and roof oils.

SPECIFICATIONS: M300 RubrMastic exceeds the standards of the American Society for Testing and Materials ASTM D 4586, Type 1. Maximum VOC is 250 grams per liter.

PACKAGING: M300 RubrMastic is available in 11 oz tubes, 29 oz tubes, 1 gallon cans, 3 gallon pails, and 5 gallon pails.

Approximate Pounds Per Gallon 8.3
Minimum Percent Nonvolatile Weight 70
Approximate Hours Set Up Time to the Touch 24
Days Set Up Time Before Applying Reflective Coating 90
Percent Elongation is greater than 100
Percent Recovery is greater than 50
Optimum Application Temperature Range in deg. F 40 to 90
Application Consistency Trowelable




M300 MSDS >

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