Rear glass hinge separated from glass

[Larryjb]

As far as i know, the 3M 5200 marine sealant is the only product worth trying. However, surface prep is vitally important. I did use this, and the repair lasted about 2 years. There is a product you are supposed to use to promote bonding to the old sealant. However, tubes of all this stuff up here in Canada would be getting very close to a 2006 hatch glass. The 2005/6 glass is mounted to the hinge differently, and has no history of failing.

I'm pretty sure that clear gorilla glue won't have the strength that the marine sealant has.

That said, I wonder if 3M 590 would have been better. It has a tensile strength of 1170 psi/MPa vs 3M5200 of 650 psi/MPa

Clear Gorilla glue doesn't give any specifications for tensile strength, so I wouldn't trust it.

 

[Merc1973]

I tried JB weld. Didn't work. Now I have to grind that crap off...

 

[Larryjb]

I tried JB weld. Didn't work. Now I have to grind that crap off...

3M 5200 for $17: probably works well if done properly. Mine lasted about 2 years. Need really good surface prep. I recall there is a bonding agent available from 3M to promote bonding to old sealant.
https://www.canadiantire.ca/en/pdp/3m-marine-adhesive-sealant-5200-white-3-oz-0790215p.html

JB Weld for $25 and is too brittle to work for this application:
https://www.canadiantire.ca/en/pdp/...teel-reinforced-epoxy-283-g-0383711p.html#srp

I'm waiting to find a used hatch from a 2005 or 2006. This style apparently does not break. Cost should be about $100.

 

[Matthew Jeschke]

I have this same issue. Consulting the forum again before I dive in. I'm going to re-glue with 3M Auto Glass Urethane #08693

 

[Matthew Jeschke]

I took my rear hatch glass off, and pulled off the loose hinge. I bought the urethane windshield adhesive. Unfortunately, they didn't have the primer though so that's on order. I'm watching tutorials on replacing windshields to study up.

My question is this... How do you clean the old urethane behind the hinge (on the glass) off? I think I need all that off the glass to apply the primer and create the best bond right?

FYI ~ Everybody who attempts this repair w/o Urethane adhesive might as well not even try. It won't hold. Urethane, specifically windshield adhesive, is designed to fasten glass to metal.

 

[Larryjb]

I finally found a 2006 hatch glass. By the time I'd get the urethane and primer, go through the trouble of regluing it, it was just easier and almost the same cost to replace it.

Curious, yow are you getting the new hinge to line up exactly in the right spot? The only way I could see doing this exactly is to remove the entire lift gate and set the hinge in place in the closed position.

 

[Doubeleive]

IF I was going to attempt it period I would just use the rear view mirror repair kit sold at most autoparts stores
that adhesive works well for attaching metal to glass. it might take a couple of them due to the coverage size

 

[Matthew Jeschke]

IF I was going to attempt it period I would just use the rear view mirror repair kit sold at most autoparts stores
that adhesive works well for attaching metal to glass. it might take a couple of them due to the coverage size

That is GENIOUS! It's going to be about $60 for the glue... I hadn't thought of that.

I finally found a 2006 hatch glass. By the time I'd get the urethane and primer, go through the trouble of regluing it, it was just easier and almost the same cost to replace it.

Curious, yow are you getting the new hinge to line up exactly in the right spot? The only way I could see doing this exactly is to remove the entire lift gate and set the hinge in place in the closed position.

I wish I had that option. I do have a nice junkyard. I could have called them but certain it would have been hundreds of dollars. They a couple years ago they switched to book pricing. there's numerous other junkyard but they're pretty similar.

I looked on eBay and they're now if you're lucky $300. I'd ultimately like though to get the better hatch that doesn't exhibit the issue.

I'll report how the urethane works. I think it'll come down to my glue / prep work. I do more or less have alignment marks. I don't think would be necessary to install on the hinge pins / hatch to align it otherwise. Just keep it really close to where it was / use alignment marks or leave enough material on sides that you know exactly where it was.

 

[Matthew Jeschke]

Doesn't look as pretty as factory but hopefully does the trick! I ended up using the 3M urethane windshield adhesive. I VERY carefully removed ALL urethane behind hinge (where mounts to glass. I also drilled out the holes in the hinge that urethane passes through. I think this will provide some extra grip / strength to glue. I did leave some urethane on sides so I could set the hinge back in EXACT position it had been in previously.

I then primed the mating surfaces with 3M windshield primer, applied the urethane and let set up for a good four days (I think you only have to wait a few hours?)... It mounted perfectly back on the truck. Driving it around ever since. I will report back if the repair fails.

I think the correct repair for this would be somehow pin the glass and place a backing plate on other side to hold the hinge. Don't even ask me how to do that. I have no clue, you'd have to drill the glass. Bean counters at GM seemed to have driven this hinge design and didn't do that. Vehicles I see with pinned hinges don't seem to fail.

I know lots of people are using other glues. But windshield urethane is chemically formulated to bond metal and glass. Some of the other methods say they will glue glass but they aren't specifically intended for that application so don't perform as well. Especially in automotive application where the stress and vibration are more.