Automotive paints and relative humidity. Say wut?

I just bought some primer and reducer from AUTO ZONE today and asked that very question ! Like some one at the Zone would know something. HA. But I have painted a few cars in my life , by no means a painter. Most turned out nice, last one I painted down here in FL in the heat and 98% humidity turned out rough with orange peel . Same with the primer I sprayed the other day. Rough and dry. Using regular Rust-Oleum reducer.

The odds of running in to an employee at Autozone that has a clue what you are talking about is zilch I worked at 3 different stores in 5 years and I will tell you only about 10% of there employees would and almost 0 would have an answer for you I know enough about paint to know to call an expert and get an application sheet for the paint you are working with and follow it closely.