Bumper Chrome Blister
 

I just noticed the beginning of a blister in the chrome on the bumper trim of my W126 300SEL.
I have no desire to get that trim rechromed, and I'm hoping one of the smart guys on this forum can give me a tip to protect or seal it before it comes off and then I'll have a bad spot on that bumper.
Any ideas how to seal it before it lifts off without making the seal noticeable?
Thanks in advance for any tips.

Typically its rusting through from underneath. is this the front bumper by chance?

Yep, probably the tip of the iceberg. I dismantled my bumper when it started on the rear and the rust on the underside of the metal was terminal, there would be nothing to rechrome. I got a replacement on ebay that was a bit pitted but solid underneath.
You could try putting some rust converter in a syringe and trying to inject it though a tiny hole, not something I've tried just a thought.

Yes, it's the front. Noticed a similar tiny spot on the rear too. Just finished repairing and painting replacement bumpers, and was going to just replace the chrome part, but I could see from the manual that getting that chrome trim off would be quite a job.

Thanks for the thoughts.