80 Windshield R&R

[Malleus]

Well i think i may of found a product that's made to work with rubber windshield gaskets, it's made by a company called C.R. Laurence Co., Inc.

First is a photo and info is on the tool to apply the sealant.

Catalog Number: 181AG ​

Used to Dispense a Variety of Liquid Adhesives, Sealers and Primers Includes Cap for Long Use Life Fits Most 6 to 16 Fl. Oz. Cans

Next is the sealant info with part number.

View Larger Image​

Catalog Number: CRL1716 ​

Flow Grade Butyl Sealant Used to Fix Leaks in Both Gasket and Gasketless Installations Adheres Well to Glass and Metal Can be Used with Any Standard Adhesive Gun

CRL Professional Windshield and Repair Sealants are a flow grade liquid rubber polymer compound for auto glass installations and repair work. It remains elastic, adheres well to glass, metal and rubber surfaces and sets up as a permanent, flexible sealant. Apply with screw-on-adhesive applicator 181AG or by brush to fill any openings such as around clips in corners, or around setting blocks and backfilling operations on new gaskets.​

And last is a little different product that should work with our trucks rubber gaskets too.

View Larger Image​

Catalog Number: CRL7711 ​

Can be Water Tested Immediately Cures to a Butyl Tape Consistency Applies Easily and Quickly

CRL Windshield Sealant is a one-part, ready-to-use sealant for resealing windshields and backlites. Also useful for sealing drip rails and pinchwelds after installation of vinyl hardtops. Cures to a tough, flexible, rubbery bead powerful adhesion to glass, butyl tape, and all metal surfaces. Black in color.​

Links to where you can buy these products.

Amazon product ASIN B018HFJPJ6
Amazon product ASIN B000K40PGA
Amazon.com: C.R. LAURENCE CRL7711 CRL Windshield Sealant: Automotive

Any direct experience with this?

 

[Kernal]

IME the same windshield adhesive/sealant that glass installers use for more modern vehicles (where they just plop the glass down onto a bead of adhesive/sealant already put down around the windshield frame) is used for our windshields, ie: like the 3M Auto Glass Urethane Adhesives along with a "Primer" to help the urethane attach to the glass as well as sealing minor scratches (see 3M links page 2).

There are a few types of 3M Urethane for Windshields, super fast cure, fast cure, etc. Apparently installers use the Super fast cure when the customer doesn't want to wait hours or overnight to drive the vehicle, but that would be tricky to use with our windshields because it's more work to get the gasket attached to the glass then get it all down in place in the body opening and then get that sealed. IMO there's not enough time to finish the job (correctly) if using the Super Fast Cure products before it's settting up.

Either way they only have 10-15 minutes to get the windshield in place which is why two installers worked quickly together (after first prepping everything and applying the primer) to get the gasket attached to the glass (with the urethane adhesive) then directly onto the vehicle, then again quickly working around the edge to apply more sealant/adhesive.

The two installers were done in under 10 minutes but because of previous issues/leaks the shop let it sit ovenight to fully cure then tested it using a water hose flooding the windshield, then checked for leaks and there were none.

IME many of the problems with poor installations are due to the Mobile installers who come to your home to replace the windshield in the driveway. They're working alone and under a lot of time pressure to get the job done and move on to the next one so are more likely to skip some steps in the correct procedures when installing our windshields. IME

FWIW

 

[Malleus]

What I was told today by an installer who didn't have the time/couldn't be bothered to care about my repair was that the OEM Toyota sealant (which was Sikaflex -256HV) was a butyl rubber compound which isn't made anymore.

I have verified with Sikaflex that this is not the case; -256 (the current product) and -256HV (OEM and repair spec) are/were both polyurethane, nonhardening, air cured, with a Shore A hardness of 45. Both require a primer, which Sikaflex generously sells, which I assume is the equivalent of Sunstar-9002 T, listed in the FSM. I have no idea why Toyota would specify the Sikaflex sealant and not their primer. The primer (socyanate type for urethane) must be suitable for EPDM rubber (see note below).

I'm waiting to hear back from them as to whether or not the -256 is a direct replacement for -256HV. I've also found that 3M lists 08350 as an equivalent for Toyota 088833-00030, for use to seal the rubber gasket against the painted windshield opening.

In the FWIW column (because this is what I do for a living), Toyota actually patented this gasket; the patent lists isocyanate primers Sunstar-9002T from Sunstar Giken CO.0, K500 (from Sumitomo Three M) and SL8861 (from Sakai Kagaku CO.) and DISMODULE RFE (from Bayer Co.) for EPDM. The patent also specifies urethane sealant (for example, CS1450 from Cemedine Co.), but states that other "conventional" sealers could also be used.

 

[Kernal]

That's interesting, tech information gleened from patent applications.

 

[Malleus]

Now if I could only find the sunroof seal...

 

[BILT4ME]

What I was told today by an installer who didn't have the time/couldn't be bothered to care about my repair was that the OEM Toyota sealant (which was Sikaflex -256HV) was a butyl rubber compound which isn't made anymore.

I have verified with Sikaflex that this is not the case; -256 (the current product) and -256HV (OEM and repair spec) are/were both polyurethane, nonhardening, air cured, with a Shore A hardness of 45. Both require a primer, which Sikaflex generously sells, which I assume is the equivalent of Sunstar-9002 T, listed in the FSM. I have no idea why Toyota would specify the Sikaflex sealant and not their primer. The primer (socyanate type for urethane) must be suitable for EPDM rubber (see note below).

I'm waiting to hear back from them as to whether or not the -256 is a direct replacement for -256HV. I've also found that 3M lists 08350 as an equivalent for Toyota 088833-00030, for use to seal the rubber gasket against the painted windshield opening.

In the FWIW, column (because this is what I do for a living), Toyota actually patented this gasket; the patent lists isocyanate primers Sunstar-9002T from Sunstar Giken CO.0, K500 (from Sumitomo Three M) and SL8861 (from Sakai Kagaku CO.) and DISMODULE RFE (from Bayer Co.) for EPDM. The patent also specifies urethane sealant (for example, CS1450 from Cemedine Co.), but states that other "conventional" sealers could also be used.
View attachment 3403135

You have saved me hours of doing this. I am in need of a windshield and I've already had one installer tell me to go away.

Even though the insurance company is going to pay for the replacement, I only want a Toyota gasket and I want it done correctly. I also need to clean and primer the frame, as my current windshield has been leaking for a while. Also the previous installer scratched all the way around the frame so I have rust bubbling around it.

 

[NorCalFJ100]

I've also been turned away from two installers. You all aren't alone. The level of detail and awareness of an iH8mud 80 series owner is unlike no other. General repair people aren't ready for us!!

 

[Kernal]

Repeating myself but when I ran into problems with a National windshield repair chain (two failures to seal along with wavy chynah glass) I called around to a few local dealerships including walking into the Service Dept of my local Toyota dealer, and asked them gently (because some didn't want to refer customers apparently) who they use to install windshields. Some didn't want to share that info but I eventually got the name of the independent installer who did all the glass work for the local Toyota and Mercedes dealers (no Lexus dealer in my area).

Once I had his name I drove to the shop and he said he could do it (I did leave the windshield intallation pages from the FSM in clear view and gently mentioned I had them if he wanted to look at them, just in case).

There were however signs of early rust around the windshield, most likely from the previous replacement attempts so I set it up where he first would remove the windshield, then I drove a couple miles (without a windshield) to a paint shop I had contacted ahead of time. They then repaired the surface rust, primed and painted around the opening, and a day or two later I picked it up and drove back to the glass installers shop where the shop owner and a helper worked together to install the new windshield (OEM at the time was still available).

 

[jkeithw]

I'm waiting to hear back from them as to whether or not the -256 is a direct replacement for -256HV. I've also found that 3M lists 08350 as an equivalent for Toyota 088833-00030, for use to seal the rubber gasket against the painted windshield opening.

Did you ever hear back about the 256 vs 256HV?

 

[RivMan]

Also following!

-Rob

 

[Malleus]

Nope. Their tech support is nonexistent.

I used Dupont Betaseal U-418 black urethane on my last windshield replacement, after much searching and sleuthing:

No primer is necessary between the gasket and glass, however you do have to apply the urethane to the gasket and install that on the glass, as directed in the service manual, prior to installing the glass onto the body.

You can use this cartridge in a manual applicator.

Although the product specs indicate a primer is necessary for adhesion to painted or bare metal, I had no trouble getting it to stick. 2 1/2 years and no leaks.

» Dupont 5504-G is the recommended primer, for use as an adhesion promoter and to fill small imperfections in mating body surfaces.
» Dupont Betaclean 3000 is recommended for surface preparation prior to application on painted or bare metals.

 

[jkeithw]

Nope. Their tech support is nonexistent.

I used Dupont Betaseal U-418 black urethane on my last windshield replacement, after much searching and sleuthing:
View attachment 3835877
View attachment 3835879
No primer is necessary between the gasket and glass, however you do have to apply the urethane to the gasket and install that on the glass, as directed in the service manual, prior to installing the glass onto the body.

You can use this cartridge in a manual applicator.

Although the product specs indicate a primer is necessary for adhesion to painted or bare metal, I had no trouble getting it to stick. 2 1/2 years and no leaks.

» Dupont 5504-G is the recommended primer, for use as an adhesion promoter and to fill small imperfections in mating body surfaces.
» Dupont Betaclean 3000 is recommended for surface preparation prior to application on painted or bare metals.

That is super-helpful. Thank you.

 

[Malleus]

FWIW, U-418 is an OEM (for who, I don't know) windshield sealant.

 

[jkeithw]

FWIW, U-418 is an OEM (for who, I don't know) windshield sealant.

looks like there is an HV option - think that's the OEM variant?

[EDIT] - it looks like HV is a 2-hour minimum set time.

 

[Malleus]

"HV" just means high viscosity. It's the fast cure type, mainly developed for driveway installers use.

 

[COS80]

Can anyone here confirm that the windshield only gets sealant applied across the bottom, as indicated here and here?