< Fields Coatings & Mastics 100 to 300 Series

Product Information Sheet
C300 RoofMastic
All Weather Asphalt Mastic

USES: C300 RoofMastic 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. RoofMastic also repairs surface fissures, seals down shingle tabs, stops leaking nail heads, cements laps on roll roofing, and bonds roofing sheets to the deck. RoofMastic 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: C300 RoofMastic is friendly to apply, even in below freezing, wet conditions. Apply with a broad putty knife. Warm RoofMastic 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 RoofMastic onto the surface until a secure bond is achieved. Seal areas exposed to water penetration with RoofMastic. Generously apply a minimum .5" thick layer of RoofMastic over the exposed area. Make 3 layer repair with RoofMastic and PolyWeb over fissures or to reinforce degraded areas. First trowel a generous application of RoofMastic over the application area and beyond the width and length of the PolyWeb you intend to install. Second, lightly trowel the PolyWeb into the RoofMastic. Third, carefully trowel a generous application of RoofMastic over the entire repair, making sure to completely cover the PolyWeb. For severe fissures, apply additional layers of PolyWeb and RoofMastic.

DESCRIPTION: C300 RoofMastic is a quality all weather asphalt mastic manufactured from 100% oxidized roofing asphalt. Select raw materials have been formulated to make RoofMastic a premium product. RoofMastic 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. RoofMastic is your best defense against these attacks. With RoofMastic your roofing and waterproofing installations will perform much longer.

SPECIFICATIONS: C300 RoofMastic exceeds the standards of the American Society for Testing and Materials ASTM D 4586 Type 1. Maximum VOC is 300 grams per liter.

PACKAGING: C300 RoofMastic is available in 3 gallon pails, and 5 gallon pails.

Approximate Pounds Per Gallon 8
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




C300 MSDS >

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