July 24, 2015
Hi Bill. We wouldn't recommend coating the underlayment directly. Elastomeric coatings like Sta-Kool 770 are better suited for coating roof surfaces like cement tle (flat or barrel), metal roofs (aged galvanized), and aged roofs previously coated with asphalt, aluminum, or tar. Visit our web site www.gardner-gibson.com for more information about Sta-Kool 770 application as well as other tips and tools. You'll find a variety of information under the Resources tab. Thanks for your question!
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