I've got some sealant coming (same pn from FSM, non hardening). Manual says to apply to vertical surfaces of the channel before dropping in the glass. This makes sense on the A pillar and roof line, but on the hood cowl channel, its more of a horizontal surface. Should I do all 4, or just a pillars and top?

I know some folks just install the gasket dry, but I'd rather future proof the seal for leaks.

It's been a while but IIRC, the installer did the horizontal surfaces first then the vertical, just before dropping the glass in place.

This was on a W126. However, we don't know what car you are talking about.

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Sam

84 300SD 350K+ miles ( Blue Belle )

You want this, it does not dry hard like urethane. It does tend to get everywhere but easily cleans up with mineral spirits ( parts washing solvent ) This works fine for sealing leaks , however do not use it to set glue in glass as it does not develop any strength.

I've used it to seal rubber set glass even alter it was installed.

3M Auto Bedding and Glazing Compound

https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Auto-Bedding-and-Glazing-Compound/?N=5002385+3293194048&rt=rud

This is on a W123. The gasket must have been aftermarket, as it was very loose on the glass. I could take the trim in and out with very little effort, which I know is not normal.

Now that I re-read the FSM, it makes more sense to pre-apply the sealant to the A-pillars and roof-line and then seal the lower channel after windshield installation.

I am using the MB equivalent of the 3m stuff that does not harden. I've spent enough money at the local MB dealer, they give me a decent price.

Thanks for the replies. Got a couple small rust holes to seal, then I'll prime and install this week.