Moisture (water)   reacts with curing agent.

Properly control   the temperature and humidity of the construction environment. Stop   construction when the air humidity is greater than 80%.

The paint is too   viscous.

Use matching   thinner to dilute the paint reasonably. (Use as little as possible   low-boiling solvents such as butyl ester, ethyl ester and toluene, and use   solvents with a boiling point higher than 160°.)

The solvent   evaporates too fast during curing.

Control the   temperature and extend the surface drying time of the paint film to extend   the opening time of the paint film.