Paint loses fluidity causing gelled consistency (increased viscosity).

Paint partially or entirely reacts and hardens, leading to gelled consistency.

Prolonged storage in excessive temperatures.

Paint can (container) not sealed securely, allowing the paint solvent to evaporate and humidity to enter the can.

Paint accidentally mixed with a different paint type, or hardener, before storage.

Paint diluted with improper paint reducer/thinner.

Securely seal the paint can (container) with the lid, and store it in a dark, cool place, 68 °F (20 °C) or below.

Avoid mixing the paint with different types of paint, hardener and improper paint reducer/thinner.