Proper way to seal windshield channel corners ?

[440]

What is the best correct and proper way to seal the bottom corners of the front windshield channels. One side has been partially lead filled so I was going to get both corners properly lead filled. Upon talking to a body guy he said not to as lead absorbs water, and that modern fillers are the way to go  

I'd rather hear what others have to say on this so I'm informed when the car goes to the body shop.

[Domino]

my BS meter just pegged!    Lead absorbs water, huh?     Sounds like he just doesn't want to do lead work.

Modern fillers based on polyester resin WILL absorb water when saturated.  

If you're not going to use lead, I'd use All Metal Filler and seal with epoxy primer.  
All metal is polyester based, but it is very dense and the Aluminum will inhibit rust.

[440]

I didn't believe it either but I'm not an expert on bodywork or the properties of lead so I thought I'd ask those here who know... I gathered he meant it wouldn't absorb like a sponge but that it's porous enough to hold moisture. I'd prefer lead work over filler any day. At any rate if lead filled then skim coated and painted it is protected from the elements anyways so    

My channels are in really good shape and I'd like them to remain that way for another 42 years. How does everyone else do it ?

[Brock Lee]

You will often find rust under the factory lead, so maybe he is assuming the lead is soaking up water? I think the rust actually started at the factory, or in some cases the lead separates from the steel and moisture sneaks between the two.

[440]

Would you recommend lead filling the corners again or some other means? It hasn't gone to the body shop yet but I was planning on lead work in the corners. It was only when talking to another body shop (due to the time taking to get in to my preferred shop) that the guy advised against lead. My corners are still great so... Just want to do it once and once only, and have it done properly.

[Brock Lee]

If it looks good and there is no rust, I vote to leave it. If you want to be safe, then use metal to metal filler. It is lighter than lead and works like bondo. I had a seam that was getting just a tad extra stress and was cracking over time. The metal to metal has been holding up going on 8 years now.