Lucas #1500 Elastomeric Acrylic Mastic is an acrylic elastomeric roof sealant intended for application to metal, asphalt, modified bitumen and most single-ply roofs. A high degree of rubber-like elasticity allows this product to accommodate wide swings in temperature and significant building movement. #1500 should be used to repair roofs and seal metal roof fasteners prior to coating with Lucas #1000 series Elastomeric Roof Coatings. Lucas #1500 is UV stable may be used for general purpose topical repairs. #1500 is available in a standard non-fibrated version, as well as #1500F Fibrated Acrylic Mastic.

Application:

Mix in any separated material prior to using. Do not store above 90ºF. Apply only at temperatures above 40ºF and rising with less than 90% humidity and no threat of rain for 48 hours. Surface temperatures should be under 100ºF to avoid premature curing. If roof surface is hot, apply a light water spray to reduce its temperature. Rusted areas must be primed with Lucas #1025 Alkyd Metal Primer.

All fasteners should be inspected and loose, broken or missing ones replaced. Seal fasteners with Lucas #1500. Material should be applied one quarter inch thick with a brush or trowel and extend two inches on either side of the fastener. For added strength, reinforce with polyester fabric. On metal roofs one gallon will seal approximately 400 fasteners or 130 ft. of seams.

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