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Just wondering what everyone uses to care for the rubber seals around the windshields. I have new ones and would like to get them to last forever.

A non-petroleum based grease is recommended for natural rubber. Most people use a silicone-based grease, although I'm partial to the old castor-oil-based red grease from Castrol.

I'm not sure what the new production seals are made from, but if it's a synthetic rubber such as Buna-N (aka nitrile), then it's resistant to petroleum products.

This chart might be useful reference: https://www.jjshort.com/Rubber-Properties.php

Almost 20 years ago, I found Vinyl weatherstrip in the correct profile for windshields.

It lasted that long, still good when I sold the truck.

I used Vinyl as well on the fenders, same report.

Best plastic to use outdoors.

Dennis

I use 303 products, their UV protectant spray is great. All their stuff is aerospace grade.