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In the end my solution was to use the big sander and 60grit. The 60 left deep sanding marks but a you lay the primer on thick to fill them.
The other solution (haven't tried on a 2 bumper yet) is a media blasting compound since the plastic deforms sometimes you can blast with certain compunds (or even a traditional sand blast) and the paint chips and comes off but minimal bumper material it taken off since it deforms instead. It really depends on the material though that works for some "flexable" materials but destroys others plus I don't know if you have a small sandblaster or not, I brought one for wheels I've never used I should have tried it myself then I could tell you if it works.
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