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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Mar 2014 Posts: 4,483 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,483 | The compound is different in the aviation version. I can never remember without cheating and reading the sheets but I think the aviation sealer contains some form of clay...kaolin possibly and super 300 contains talcum plus some of the same ingredients as super 300 and one of them contains carbon black. Which since super 300 is black, I'll say that's the one. I don't think one is thinner though. I've used the aviation sealer with good results for over 40 years. It will not harden over time. Not a bad product at all. Just the other is thought to be better.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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