Painting, as in house painting. Don't paint if the ambient temperature is going to drop below 40 degrees (F) at night. I prefer 45 or 50 degrees myself.
This assures proper curing and maximum longevity of the coating.
I'm surprised by how many people paint when it is going to drop down to, or below freezing (32F) at night.
When in doubt about any coating, adhesive, epoxy, or whatever liquid, gel, paste product...always read the instructions on the container.
The other day, I found out that standard plumber's putty is not suitable for using on acrylic tubs.