How Long Does Spray Paint Take To Dry. Keep in mind that if your project requires the application of multiple coats of spray paint the required spray paint dry time starts only after your last coat has been applied. It may take 20 minutes in a hot room.
So the solvent evaporates faster and because of the air between the polymers it leaves a smooth surface. Do not close painted doors for at least 8 hours. This time period is based on thin coats being applied in temperatures above 450.
It depends on the materials you are applying on.
Other Factors to Consider. Waiting for the final output to become fully dried up on the other hand could take between 3 to 24 hours. The average drying time for metal is around 10 minutes or less depending on the room temperature. As a result you will get smooth and clean surface apply spray paint.