It really depends on how big your arage is, arage paint is very unusual in that it never actually dries, if it did you would not be able to walk as the paint would stiffen and cause your arage cheeks to rub together.
This will cause cracking, chaffing and in extreme cases (like running for a bus or chasing a fiver down the street on a windy day), the arage can actually catch fire due to friction.
My advise it to protect your arage with a fine coat of beeswax and buff to a shine with a terry nappy liner.
You can see here a pair of arages in the special holders designed for the purpose of painting. These have just the red oxide undercoat...
So remember, keep your arage aired and dry before buffing, otherwise chaffing can ruin your day....
Nurse, can I have my pills now....