The more humid the area, the faster the dry time, which usually varies from 3 to 6 hours. No, but if you do, remove it at once with solvent or lacquer thinner. That's why you must always paint in a well-ventilated area and keep your nose away from the paint container. POR-15 is not dangerous if you follow our simple directions. Seasoned metal and sandblasted metal are also good.
New steel is coated with a protective oil finish at the mill.
Silver contains metal filler and should be used in badly rusted, pitted areas. It will fill in holes better than black or clear. Black is generally used on frames, underside of fenders, etc. because that's the usual color there. Once topcoated, POR-15 will remain effective for many years. No, your POR-15 protection will remain, but the sun will change its appearance cosmetically.