Trying to decide on filling the rear cab seam above rear window. Mine has no rust, but do not want cracked paint. Will need to weld up if I fill it. What have most people done? Thanks

 

I used Sem seam sealer on my 49 used 3m seam sealer on my 64 a few years ago both seem to seam seal good

 

Personally, I like the seam. With the short back window, it breaks up an otherwise big roof panel.

Just my opinion, your mileage may vary.

 

I like the seams. at the econoline group I belong to, some fill-in all the seems on the old 60's vans. to me, it ends up looking like a big refrigerator.

 

I filled the seam on my '49 20+ years ago, still looks good. I pushed it in so there wasn't a big area to cover with paint thus limiting the movement of the sealer so the wouldn't be cracking.

 

I have done a few...some were reworks of failed jobs that owners had done DIY. It has been my experience that if a non-welded seam is going to fail that it will do so at the corners. A seam doesn't have to be in a seamless (no pun intended) bead but it does need enough weld to keep the seam stable. Clean the seam well and wire brush it to remove any embedded paint and/or seam sealer. Tack weld across the seam at about 1/2 inch intervals. Grind the welds flush and fill the remaining seam with structural adhesive (3M 08115 works great). Sand and finish with body filler and then primer/paint.

 

I am also unsure of which way to go I would like the smooth look but it is going to make a big cab look bigger . I will be interested to hear some opinions and more importantly see some pics

 

On both my builds I filled all the seams by welding them up and body fill, I like the smooth flow but there is another thing to consider and that is if there is ever any damage to repair down the road those seams give you a body break you can mask a section off and not have to try and blend in the repair..

 

I'd weld it, I filled mine and as Charlie stated it already started to hairline crack at the corners, so I will be grinding it out welding it up and refilling and repainting.