I have sprayed many ornamental fence and gates over the years, and when you get orange peel, you do not have enough thinner in the paint. The building was not insulated and sometimes the doors were open.
Having said that.
My bow room is insulated and tight, dehumidifier keeps it at 35/40%. I got a bumpy finish with 4 or 5 different clear coatings, some out of a bomb can.
Today I sanded the bumps down on a bow I coated last week and hung it in a metal building with what ever humidity was outside with a nice finish.
I think that the thinner dry's so fast in my bow room that the coating does not have time to lay down.
I hope I can help some of you get better finishes on yours.