Having great luck joining plastic parts, with Permatex plastic welder, a special 2 part epoxy. It can even be used to successfully repair the plastic urethane panels on the Fiero.
I just joined a torn edge piece to the front fascia with Permatex plastic welder and its strong as a rock.
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "