Can you apply silicone in the rain?
Silicone coatings are moisture cured, meaning the more moisture in the atmosphere, the faster they cure. Rain doesn’t wash the coating off, it actually cures it in place. … The rain will leave dimples in the coating that are harmless but are unsightly. If it’s raining, don’t start applying silicone.
If caulk gets wet before it cures, then the moisture cannot evaporate quickly. … Too much moisture can also lead to the growth of mold and mildew.