What happens if ceramic coating gets wet before it has fully cured?

Premature exposure to rain, dew or wash water can interfere with curing and may leave water marks, uneven behavior or reduced durability. The risk depends on the coating chemistry and how much curing time had already passed, so the manufacturer's initial water-avoidance period should be followed closely. Nasiol coatings, for example, call for keeping the car away from water and moisture for the first 24 hours and waiting 48 hours before any detergent wash. If the car gets wet early, dry it gently with a clean microfiber towel rather than letting droplets evaporate, and inspect for marks once the coating has cured. Spots left by early rain may sit on top of the coating or may have marked it before it hardened; avoid strong chemicals until the coating has cured, and use a coating-safe mineral remover afterward if spots remain.