Stripped it back to standard with the thinners, cleaned it thoroughly and sanded it before primer.
Now the primer is drying out unevenly/rough at the edges :S
did you use plastic primer, as i 1st used normal primer and that was useless so bought some halfords plastic primer and it worked a treat.
this has been sanded back to bare plastic with 2 coats of plastic primer and 2 coats of normal primer on top, going to spray some colour on it today