Sealant Curing

The curing rate of mixed sealants varies with temperature and humidity. For example, at temperatures below 15^oC, curing is extremely slow. At temperatures above 21^oC, curing times are usually faster. For best results, a temperature of around 25^oC with a relative humidity of 50% is ideal for curing most sealants.

If the temperature of curing is increased to accelerate the curing time, it must not exceed 50^oC at any time during the curing cycle. The heat can be applied by using infrared lamps or heated air, providing the air is dry and filtered.

To see if curing has been completed, a practical test can be done by laying a sheet of cellophane on the work, and checking whether the sheet adheres to it (lack of adhesion indicates full curing).