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| Term | Description |
|---|---|
| Tack-free time | In spray polyurethane foam roofing, a curing phase of polyurethane foam when the material is no longer sticky. When the polyurethane foam is tack-free, it can be sprayed over with another pass, referred to as a "lift." With some care, the polyurethane foam can be walked on soon after it is tack-free. See "lift." |