the problem with too much paint thinner/stripper is it can eat at the plastic of the shell. like custom said, you can try to wet sand just the clear down, and reclear it. or most likely you need to sand it back down and start the paint process over.
with a car, we would wet sand the clear with 2k-4k sand paper and reclear coat it, but you need to do the whole quater pannel to keep it from flashing. (flashing is when the repair spot stands out from the rest of the paint.)