Seam Goop (?) Newbie question.....

[Zeked]

First time Frame up resto on my '87 Short Step 2x and I notice that there is
some kind of semi-flexible  "goop' between the major panels/around the bed step/drip rail etc.

What is it? and where do you buy it? I suspect 3M makes it and is there better/worse
ones to know about.   I apologize for the description, but I have never encountered
this stuff, but I dont want to put the body panels back and not do it right.

Thanks

Zeke

[VileZambonie]

 seam sealer

[fitz]

3M makes the seam sealer in brush on form or you can get it in the tube for a caulking gun.

[Blazin]

Dynatron make it both ways, good product. Have also had good results with Transtar brand.

[frito-bandito]

3M seam sealer works good.