Try this, and you'll chuck all your other putty in the trash: mix medium viscosity CA approx 50/50 with talcum powder, 'til you get the consistency of runny toothpaste ( I pour the talc on a vinyl-type coffee can/margarine tub lid, drop the CA into it, and mix the talc into the CA letting the CA be my "limiting factor" on how much filler is produced at one time). Apply the composite to your seam, ejector pin mark, gap, smooth it, wait 15 min, and start sanding! Apply it sparingly, however, as it doesn't shrink like other putty. You can also wait 15 days to sand, as it doesn't get harder the longer it cures, and it works on resin as well as plastic. It doesn't soften thin (vac) plastic like petroleum based putty does, and actually adds structural integrity, so you don't have to back large gaps with plastic . Evidently the "Car Guys" have been using this for years to do major bodywork alterations on their models. To see how well "Supafilla" (my name for it) works, carve/gouge a dime-sized hole in some 40 thou plastic sheet, fill the hole w/ Supafilla, and sand both sides. When you're done I think you'll be pleasantly suprised. Regards, Rob