Quoted from Niterider:
I've never cleared a playfield, but I've done quite a few vehicle paint jobs so I'm thinking contaminants left on the playfield before you applied the clear. That is the one time you really want to use fresh wipe cloths. Some waxes can be a pain to get rid of, so a couple of good cleanings may be needed.
It's likely not a lost cause, give it a few days to harden and wetsand the surface to remove all the fish eyes. Then lay another coat or two of clear. If you really want to go nuts, give that coat a week and wetsand it again with some really fine paper and then polish it with a buffer to a mirror finish.
Thats a bummer. I've worked around body shops for many years and it's tough to determine the cause of contamination without being there. Rags are suspect, although as someone already suggested contamination in the lines and maybe temp could be the culprit. You may also check the sandpaper, yes some has silicone in it. Lastly, did anyone spray any type of tires dressing or silicone product around your project? I still lean towards the lines or silicone in the cloth-
I'd suggest process of elimination to diagnose-
Try spraying something else(wood) with same clear, check sandpaper first-if no fish eyes- you have your answer on gun(could still be temp though)
Try another piece, this time using the same rags-will determine if rags-