OK, I've had the rear bumper cover off of my Firenza for a long time now. I stripped all the old paint off, then washed it well, then used Duplicolor Plastic Prep spray on it. I then used the Duplicolor Self-etching primer according to directions (says right on the can it can be used for plastics). It looked good so I then the next day I shot it with the Duplicolor Universal Black, 3 light coats. 10 hours later I checked on it and found the paint had bubbled and I was able to knock off this much with the side of a piece of sandpaper. It looks like the primer did not stick at all:
Any ideas on what went wrong and how (once I get all this scraped off) I can successfully paint this bumper cover?
Thanks,