Topic
Polyurea and polyurethane chemistry: formulation, cure behavior, and how material properties are actually measured.
Polyurea gels in seconds because amines react with isocyanates far faster than polyols do. That speed buys moisture tolerance and same-day return to service, and it costs you flow-out, recoat windows, and any forgiveness for bad prep.
ReadPolyurethane is isocyanate plus polyol. Polyurea is isocyanate plus amine. Hybrids blend both. What that difference does to moisture sensitivity, working time, recoat windows, and UV behavior, and how to specify around it.
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