I don't know about the plumbers putty melting. It was always in solid form when we get it from the work truck to use. The trick gets really hot parking out in the sun. Another suggestion would be "thumb gum." That's that green or gray putty that they slap on electrical pipes to keep bugs and water out. That stuff can take the forces of nature face on.
I don't know about the rest of you guys. Sure silicone will work, but will be a pain to rid of with out messing with your paint. Plus I think it stores too solid for the amount of flexing of driving. I think it could make a dent.
JustMy opinion
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