Body panel sealer/putty

I am in the process of preparing the beast for painting. I am noticing the 50 year old putty between the panels and at the seams is cracking and even non-existent. There are gaps on the windshield frame that I can see through. The other big area is the rocker panel below/behind door. All I see there is air! Does anyone have a suggestion as to what I could fill it with? Preferably something that will last, that I can paint over, and is easy to work with. Silicone caulk is a no-go as I have found paint does not stick to. Thank you.

I've been using Eastwood seam sealer replacing floor panels in my Fairlane. Quart cans but I think they make tubes too. A little pricey but a quart goes a long way. I've used it on a patch in the bottom of my swamp cooler and replacing 2 floor pans, just getting to the bottom of the can.
paintable, won't get brittle.

It says "brushable" but.... I guess if your brush is a putty knife..

I got mine on Amazon, was going to post a link can't find it on there now. You can get it direct.
http://www.eastwood.com/ew-brush-on-...FQ2UaQodRswNwQ

3M makes some good stuff too but never used it.

Thanks Von. I will see if I can find a squeeze tube of the stuff. If not then, well putty knife and sanding!

POR makes a putty, but not sure that it is workable like a seam sealer...3m panelbond is awesome stuff that will work as a seam sealer and fills some small holes....PC7 epoxy has some good reviews too....I think all of them are sandable and paintable make sure you check for that,whatever you get.....

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Originally Posted by 44willysmb

Thanks Von. I will see if I can find a squeeze tube of the stuff. If not then, well putty knife and sanding!

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I don't think the Eastwood seam sealer is sandable, like bondo. I think it's supposed to stay a little soft, like the old factory sealers. Not gooey soft, but it doesn't really harden up either.
In between slatherings the stuff on my putty knife would set up and I had to take it off with the wire brush on my bench grinder. Tough stuff.
More for hidden areas and panel joints.