Spider webbing in bumper cover plastic

[DavidL]

I’m working on a 1987 Camaro bumper cover and I uncovered this spider web like pattern in the plastic under the old paint. I can’t feel them when in scratch it with my fingernail so they’re not deep. What’s the best way to prep this section so it won’t cause problems later?

 

[Barry]

Your only hope is epoxy unless you to remake this section.
What would I do?
Three coats epoxy over 180 and cleaned with 700.
Let set 4 to 5 days sand smooth with 180 and 2 more coats epoxy.

Those hairlines will work their way through 2k primer and polyester primer, not epoxy, if done right due to strength and flexibility.

I did not address the chip or gouge part but any 2 part bumper repare from sem, 3m, fuzor norton will handle that fine.

 

[Barry]

I would not paint over that.
It would be a new bumper for me.

We fix gto endura bumpers worse than this every day.
Where are you going to get a new OEM bumper??? Maybe there is one out there? one gto I looked 3 to 5 months for replacement, and all were in worse shape than what I had.

 

[texasking]

Painted a late 70's Camaro bumper that looked like that all over. Epoxy only (3 sessions) and it still looks perfect after 3 years with no signs of cracking. (Get that paint out of the corners )

 

[DavidL]

Thanks for the help guys. I was planning on only using epoxy on the bumpers so I was on the right track.
Tex - I’ll get the paint out of those corners. I wanted to consult he SPI experts before spent a lot more time on it.