try turning up the pressure on the regulator to about 50psi and blow off your desk area first… also you could get a spray bottle from Wal Mart (empty) and put some water in it and mist your desk area before spraying…
A tack rag can be made but it’s just cheesecloth embedded with wax. If Home Depot doesn’t have them, try your auto parts store. Also think about gloss coat instead of Future.
I have better results brush painting Future and storing the model in an enclosed space to dry. The only problem is to make sure that it does`nt collect on lower edges.
Hope this helps.