Polyurethane closed cell and Isocyanate in open cell. They both mix with the A side .The stuff that reacts with water. I would not use it for a rain barrel. Can provide link for MSDS
Polyurethane closed cell and Isocyanate in open cell. They both mix with the A side .The stuff that reacts with water. I would not use it for a rain barrel. Can provide link for MSDS
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