ringing aluminum round horn (how to damp? :: Pics incl.)

I would try adhesive butyl rubber.
It is heavy for its size and will stick to metal under water.
Weatherproofing Kit

It's great for pranking the dude that can never seem to park right.
Just stick some to the top of his tire and the first revolution it will pick up every rock it finds.
Then they are stuck in the tread and he will spend HOURS picking gravel out of the tread.
 
No, it is a very sticky and heavy 3/16" thick rubber tar stuff.
We call it Monkey Poo or Bear Crap cause it never comes off (it will with GOO Gone).
It's very similar to the substance used in Dynamat.
 
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