The duration a fluid-applied membrane, primer, or coating needs to release solvents or water before it can safely withstand rain, dew, or freezing temperatures. Until this period elapses, the material remains vulnerable to wash-outs, dilution, or freezing damage. It depends heavily on ambient temperature, humidity, and wind speed.
Heard on the job
Check the forecast before you spray, because that primer needs at least a four hour drying time before the rain hits.
Insider tip
High humidity can double or triple the drying time of water-based products.
Do not mix it up with
- Skin time: Skin time is when the surface is dry to the touch, while drying time means the material can withstand weather.