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Old 09-19-2018, 08:46 PM
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1976 Trans Am urethane bumpers

urethane bumpers. Whats the best primer to use that wont crack on the sides of the bumpers. I had the bodyshop primer and paint my bumpers and the paint cracked all over the place. I just striped the bumper down to its original urethane yellow material. Not one crack or spier crack on these bumpers. Any Suggestions?


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Old 09-20-2018, 05:21 AM
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They probably didnt use a flex additive,repaint it and be sure to add the flex additive

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Old 09-20-2018, 05:28 AM
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Theres no special anti cracking primer and paint for use on ancient polyurethane, the same products are used for any substrate now. Wet the bare bumpers with wax and grease remover and watch as it dries to see how ate up with cracks they really are. The way to prevent cracking on the sides is to have the reinforcement in place that goes there. Think about your question, its like saying "My engine blew up right after somebody built it. What oil do I put in it to make it not blow up ever again?"

You probably will need to replace the bumpers just to get rid of cracking. Lots of Firebird owners do. Age has made the originals not very usable.
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