If your already wearing a good quality respirator with long sleeves and gloves your basicly doing about the same as most backyard painters that paint cars/trucks or motorcycles from his family garage. Your actually one up on me, cause I can't do squat in gloves so I never wear them......I do have a shoot suit and I will say that its a definite step up from just wearing long sleeves....its about like puttin on a space suit...lol....we'll, maybe not that bad.....but it is a very tight weave material and it does offer much better protection from overspray then regular street clothes.....They are not very expensive and might be worth looking into if you shoot much clear, or if you just want that added piece of mind.
I think I'll get a suit and head sock in addition to the respirator. I did some research on isocyanates and they are extremely dangerous. Lots of cases of people having bad reactions to them or even dying from overexposure.