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?

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

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.