< Fields Coatings & Mastics 100 to 300 Series

Product Information Sheet
A300 AtcoMastic
All Weather Asphalt Mastic

USES: A300 AtcoMastic 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. AtcoMastic also repairs surface fissures, seals down shingle tabs, stops leaking nail heads, cements laps on roll roofing, and bonds roofing sheets to the deck. AtcoMastic 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: A300 AtcoMastic is friendly to apply, even in below freezing, wet conditions. Apply with a broad putty knife. Warm AtcoMastic 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 AtcoMastic onto the surface until a secure bond is achieved. Seal areas exposed to water penetration with AtcoMastic. Generously apply a minimum .5" thick layer of AtcoMastic over the exposed area. Make 3 layer repair with AtcoMastic and PolyWeb over fissures or to reinforce degraded areas. First trowel a generous application of AtcoMastic over the application area and beyond the width and length of the PolyWeb you intend to install. Second, lightly trowel the PolyWeb into the AtcoMastic. Third, carefully trowel a generous application of AtcoMastic over the entire repair, making sure to completely cover the PolyWeb. For severe fissures, apply additional layers of PolyWeb and AtcoMastic.

DESCRIPTION: A300 AtcoMastic is a quality all weather asphalt mastic manufactured from 100% oxidized roofing asphalt. Select raw materials have been formulated to make AtcoMastic a premium product. AtcoMastic provides superior elastic performance against thermal shock, the daily expansion and contraction of a roof caused by temperature changes. In addition, the sun's UV rays attack the roof membrane making it brittle and weak, inducing membrane ruptures during thermal shock cycles. AtcoMastic is your best defense against these attacks. With AtcoMastic your roofing and waterproofing installations will perform much longer. AtcoMastic is asbestos free.

SPECIFICATIONS: A300 AtcoMastic exceeds the standards of the American Society for Testing and Materials ASTM D 4586 Type 1. Maximum VOC is 300 grams per liter.

PACKAGING: A300 AtcoMastic is available in 11 oz tubes, 29 oz tubes, 1 quart cans, 1 gallon cans, 3 gallon pails, and 5 gallon pails.

Approximate Pounds Per Gallon 8.2
Minimum Percent Nonvolatile Weight 70
Approximate Hours Set Up Time to the Touch 24
Days Set Up Time Before Applying Reflective Coating 90
Optimum Application Temperature Range in deg. F 40 to 90
Application Consistency Trowelable



A300 MSDS >

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