Update on finish. I went to a different supplier and got two more cans, then I sanded back the body a bit and re-spray and YES the gloss is back. So it looks like the other two cans are label wrong or faulty in some way. It wasn't humidity because before doing the body I just finished the neck but didn't have enough clear left in the can to carry on so I got a new can and that's where the problem started. Anyway problem fixed just have to wait for 3 weeks now befor I can start to wet sand. I will be adding a build diary soon. Stay Tune.