HI Danielle
Back to your post after several weeks, 2 things, you mentioned that when you sprayed the hull there was a terible mess, try hanging a damp sheet around the spray area, (DAMP) this causes the overspray to stick to the sheet and not go everywhere, the other or combined reason is that you posibly had the spray presure to high for the thickness of paint, this would also give a sandpaper effect as the paint is already drying befor it hits the surface.
Hope your problems wont stop you spraying, the effects and finish with practice can be superb.
Your photo of the speed controlers, are you fitting a plate above the rudders? if not please make sure the wireing cant droop down into the chain drive.
Regards
Mark