Orange peel

Ok so I painted my rear valance today and it looks like it's not going to lay down .
The product is SP 150 Urethane , it's a colour matched single stage spray bomb , I have used it before in the hot summer to spray a pair of wheels and they came out great , the product layed down when it dried and the gloss came up . This time it's a cooler day 50-55F , the gloss doesn't seem to be coming up and it looks like it's starting to show orange peel .So whats the solution ? Do I cut polish the peel then shoot a clear coat? Do I just shoot the clear and hope it fills and flattens? Do I have to sand it down and start again ? I suck at body work clearly so I could really use the wisdom of a painter here.