@IaM-Ray posted:Paint the edge cream with plastic paint
My concave Sierra Madre mirror spit out it's plastic ring and deposited the glass neatly on a rug.
Fortunately, bathroom silicone caulk is a reasonable facsimile for said imitation eggshell. Two plastic rings broke in shipping so I'm happy the surviving mirror lasted two years on the car.
I must admit, Sierra Madre must have invested quite a bit to train it to drop the mirror on the nearest rug.