How does high humidity in the workshop air affect drying of paint on vehicle surfaces?
Slows down the drying process
Paint dries mainly by the solvent or water in it evaporating from the film into the surrounding air.
Evaporation depends on how much moisture the air can still absorb; when humidity is high the air already holds a lot of moisture.
With less capacity to take up more vapour, evaporation from the paint film becomes slow, so the coating stays wet for longer.
Therefore high humidity delays curing rather than speeding it, and does not instantly rust metal or change the paint colour.
Hence, the answer is Slows down the drying process.
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