SMARTCOAT 300 Non-Fibered Acrylic Mastic

Coverage: Approximately 12-13 sq.ft. per gallon applied 1/8" thick; additional material may be required when 3-coursing to saturate and encapsulate polyester fabric.

1. Clean roof surface thoroughly with SMARTCOAT 100 Roof Wash. Surface must be free of dirt, dust, oil, grease, wax, rust, chalky or loose paint, mildew and any other surface contamination that may inhibit adhesion.

2. If adhesion test indicates primer is required, prime surface with SMARTCOAT 210 Universal Primer. When applying on a smooth or granulated modified bitumen or built-up-roof, though most granulated surfaces do not require primer for adhesion, SMARTCOAT 200 Asphalt Bleed Blocker will serve prevent top-surface yellowing from migrating bituminous oils.

3. Inspect all fasteners; replace loose, broken or missing ones.

4. Material should be applied 1/8" thick with a brush or trowel and extend two inches on either side of the fastener or split. For added strength, reinforce with polyester fabric and apply a second troweling of mastic. Apply only at temperatures above 50ºF and rising with no threat of rain for 48-72 hours.

5. Allow MASTIC to dry 4 to 8 hours prior to coating with SMARTCOAT 400/401 Acrylic Coatings; MASTIC cures by ultraviolet rays (UV); allow for sufficient daylight. MASTIC will lose its tack when it is suitable to be coated. Cure time is affected by environmental conditions.

6. Clean wet coating with soap and water. Dry coating may be removed with mineral spirits. Use care when handling solvents.

For more information, see published SMARTCOAT specifications at www.certainteed.com

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