Sealing Windshield

[Snoots]

Trying to come up with a good combination of rust treatment/primer/paint is overwhelming.

not many people on the paint forums seem to understand anything other than show quality finishes.

NO SHITTE! They always seem to think you have unlimited $$$$$$ to work with.

 

[Gatorhator98]

Not to mention time. I just want to get the rust or whatever this would be considered sanded/converted as best possible to keep it from coming back through. I don't want to epoxy primer, body filler spots, high build primer, block, primed again, paint etc. There's plenty of dents and dings that won't be getting fixed so why would I want to block the whole fricken thing multiple times. Just want it to be sealed to prevent surface rust from coming back under the paint.

You must be registered for see images

 

[Randy and Easton]

We have Been having a lot of rain in Texas lately (not complaining) but we found a leak we thought we had fixed with new Precision gaskets all around. In reaching out to Jeff Gau at Precision today he said I need to add sealant between glass and seal. He sent video, and it went as far as sealing the gasket to the pinch weld of the frame first? This was the first time I ever hear this, and not sure if that would have made of windshield glass installation any easier( it was not!) anyway, The video suggests 3M window weld. Anyone have luck with this after install? This is where it leaks, not bad but very annoying.

Thanks

Randy and E

xc_hide_links_from_guests_guests_error_hide_media

 

[SirRobyn0]

So my truck came to me with a huge crack in the windshield. I'm lucky enough to be friends with a glass guy so I had him do it. The old gasket was urethaned to the windshield frame, the drains were plugged. There was a moderate amount of rust, with mild pitting and yes it was leaking. He cleaned up all that krap, put rust converter on it and installed a new windshield no sealants used and it has been great. No leakage at all.

 

[R Carnella]

I always use urethane on the pinch welds only!

 

[Randy and Easton]

Well, we did not want to pull the windshield, it was a pain to put in so we just taped everything off and used the 3M 08608 Windshield weld. We will have to wait and see if it solved our problem. Did a line between outside rubber gasket and glass and then on the cab frame side down to corners making sure to leave drain holes open.

Precision recommends using 3M 08509 Bedding and Glazing compound on pinch weld and then attaching gasket. Then the 08608 between the glass and the gasket. We will let you know if we got the leak this time.

Randy and Easton

xc_hide_links_from_guests_guests_error_hide_media

 

[Randy and Easton]

It’s a bit messy but cleans up with adhesive remover and window cleaner. Wear and change gloves often.

 

[DanMcG]

How does sealing the glass to the gasket help to prevent leaks? I keep reading about doing it but I'm still clueless why.

 

[SirRobyn0]

How does sealing the glass to the gasket help to prevent leaks? I keep reading about doing it but I'm still clueless why.

My guess.... The theory is to keep moisture from wicking around past the glass and rubber seal. I also remember my glass buddy telling me some aftermarket gaskets don't fit very well.

Wow I just went back and read what I wrote earlier and I didn't go into much detail so I'll do that now. My old windshield leaked a bit and was cracked when I got the truck. My buddy who is a glass guy came by with a new windshield and gasket. The old windshield was urethaned in gasket to glass and gasket to windshield frame, drains full of it. All that sealant and it was leaking. There was some rust and pitting on the channel. He cleaned it up with a wire wheel painted it with a rust converter, then he went over the slightly pitted areas with I think like a glaze or filler, and then painted over that. Really the rust I had was not bad at all, he just said that if the frame is good and smooth and straight it'll seal up tight. He cleared all the sealant out of the drains too. He installed the new windshield & gasket with NO sealants of any kind and it has sealed up good for the last 3 or 4 years. He was at the shop for nearly 3 hours doing the job a good portion of that time was getting the channel prepped right and waiting for his paint to dry.

Short version from my glass guy, if properly prepped and installed in the truck with a good windshield channel no sealants should be needed.

My thought is If a guy is determined to use sealants at least make sure you don't fill the drains up with it.

 

[scrap--metal]

In reaching out to Jeff Gau at Precision today he said I need to add sealant between glass and seal. He sent video

Looks like a royal PITA, and that may be a canned statement for when they do leak with a new gasket. I'm not saying you did anything wrong, Randy, but I think there has to be something more to it...

Plenty of these windshields have sealed for years/decades without any sealant. I wonder if it might be related to how the gasket is initially fitted/installed. Or maybe whether or not lube is used while installing the gasket to help it slide and fit in a more even manner.

I haven't wetted my K20 down since replacing the windshield and gasket a couple months ago, so maybe mine still leaks too??? Now I'm a little scared.

 

[scrap--metal]

Wow I just went back and read what I wrote earlier and I didn't go into much detail so I'll do that now.

I love the details, Rob. Keep 'em coming!

Your communications skills are second to none on the internet these days.

 

[CalSgt]

My K10 had urethane (or sealant of some sort) between the gasket and the body when I broke it down for restoration a few months ago. I know we had replaced the glass one time in the 25 years I've had it but the gasket looked original and had never been removed by us. I just assumed the sealant was factory

 

[dvdswan]

Don't put sealant on the gasket for the body side or glass side. It wasn't built to have any. Make sure the drains are clear, there is no rust, and the body seam is straight and in good condition. I had to fix mine from rust and I never had a leak during the 4 years I had after that.

I tried to find my thread where i fix the rust in the bottom and top of the windshield but couldn't. there are lots of pictures showing the work if you care to hunt for it.

 

[gmbellew]

the service manual shows urethane on the pinch weld before gasket is installed. and on the gasket where the glass sits. some sort of primer goes on the pinch weld and glass before contact with the urethane.

 

[SirRobyn0]

I love the details, Rob. Keep 'em coming!

Your communications skills are second to none on the internet these days.

Thanks Calvin for saying that. I just don't know sometimes if my longer drawn out explanations are appreciated.