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I set the bumper in exactly the right position and then clamped the primered
steel in place with bondo smeared all over the front. I let the bondo
set up and pulled off the clamps and the steel just fell off the fiberglass.
Never bondo over primer, it is only as strong as the bond of the primer
to the steel. I spent a good bit of time chiseling the bondo off the fiberglass
then ground off the primer on the front side of the steel.
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