When Miami-based Pro-Tech Water- proofing and Caulking Co. was sum- moned to help create decking for a new hotel swimming pool, they placed a hot-rubber membrane to create a sealed waterproof system over the concrete. Masons later finished the job with brick pavers and planters. Applying the 400-degree, fast-setting product requires working with care and quickness — about the pace of a fast walk — say those on the job site. “T his is a p

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