This thread is a little old but I just found I had the same problem. I've avoided using the automotive clear coats for several reasons, the most important having lived for years in an apartment building without a proper spray gun and the rather dangerous nature of 'death paint', especially in that setting. Well now in the new house I decided it was time and not spending weeks sanding and rubbing dope sounded great! So i bought the whole spray outfit, special respirator, etc. and a gallon of Nason clear coat/activator. I had two new ships ready to coat in preparation for the coming team trials. I shot them both through a foggy eye protection only to discover they both had BAD orange peel. Looked like the texture of a non-skid shower floor. This stuff laughed at my attempts to wipe it down with acetone or lacquer thinner. Sanding was useless. I stuck them both behind the coach where I couldn't see them and checked my blood pressure-yep need to take a pill.
Long story short I stumbled upon Kleen Strip Premium Stripper while looking for something else at Walmart. It says non-methylene Chloride formula. Sounded a little safer than the death paint was. I shot the airplane with the stuff. It went from orange peel to cottage cheese in about ten minutes. Then it was dry almost immediately. This I sanded on today and removed about half the problem. I'll shoot it again however many times I need to until I get down to something I can handle with acetone and sandpaper. At least this stuff seems to have saved my pork behind.
Dave
The jury is out whether I'll use this stuff again. I'll have to master the spray gun(s) I bought and do a lot of test spraying before I point the nozzle at a new airplane again...