I am replacing the windshield in a cuda and have the 3m windo-weld urethane adhesive 08609. i have read the directions and it looks like i dont need to use primer on the car body since it is all new paint and no bare metal but what about the glass? the directions say clean and prime the glass? i dont remember using primer last time i did a windshield and it didnt leak but that was a long time ago so i'm not sure.
another question , how wide of a bead of sealer do you normally use around the window before you set the glass in?
just looking for some pointers and advice before i go make a mess.

thanks

I've heard of that stuff failing because the paint underneith it failed.

that was the case with my 2000 F150, the gasket failed because the paint pulled away at the seam.

Yes I think the primer is needed, it is hard to buy. The glass guys don't want to sell it, yet they use it themselves.

What little I've used of it.....that is some nasty stuff. I wish it fail as far as the stuff that hardened on my painted surface that you can still see. Never used a primer to install. Clean up before it sets up.

It makes sense that a painted surface break free before that stuff would let go of the paint.

Call a paint supplier and see what they recommend.

ME? I'd clean it with some lacquer thinner and git 'er done.

Yes you should use it if you want the seal to last.
It is messy so you should have nitrile gloves and be wearing old clothes.
The auto plant where I work(MAP), associates in that area have primer all over their work clothes.

3M 08681 Primer

http://www.levineautoparts.com/3m08681.html

http://www.amazon.com/3M-08681-Single-Step-Primer/dp/B000PEZAU6

http://www.maineautocolor.com/catalog/categories_name-c-0/3m-single-step-primer-08681-p-188

Keep in mind Urethane is not UV stable. That is why all new cars use the Black edges on the glass.

How long before it breaks down? Don't know.

Butyle tape is the stuff of choice for me. Good enough for the factory good enough for me.

The professional glass installer I had put the front and rear glass in my 1970 e-body used the primer. It was nasty stuff. He also used a foam stip to form a "dam" along the edge of the glass, set back about 1/3 of an inch on the inside before he applied the bead of urethane. It helped keep the glass from settling in too deep once the glass is set. It also left a nice inside appearance (not that you can really see it). He also replaced the stainless trim before the urethane set up, so the depth would match the trim's depth. It was a two man job, they were very experienced and the results are very good.

..my neighbor has operated an auto glass business for 35 years..i got downsized about 10 years ago and work for/with him part time.
he has installed thousands of windshields.
we prime only where their is bare metal never on the glass.

thanks for the good advice. i called napa and they are ordering me the 3m brand primer that the tube of urethane recomended on the back side.the car was blasted bare,epoxy primed and painted so the paint should hold good. i wondered if the glass had to have the primer on it? I didnt know the urethane would not be uv resistant, could this be a problem?
i did see where you could buy the butyl tape at napa. they have 3/8 and 5/16. i had never heard of this stuff until i started messing with old cars , most of the guys i knew used urethane. Is the butyl tape the best idea since thats what i assume the car came with originally? how does that stuff work?

..all manufacturers eventually did away with butyl.
you can still use it but you must buy the correct size..it positions the glass at the correct height for your trim.
when we use it we run a tiny bead of urethane to ensure a leak free installation.
clean up with acrysol..if you get urethane on you,it takes about 6 showers to get it off......

When I had my Challenger i installed the glass myself (first time ever to be honest) i got the 3m Butyl tape at Napa in the correct thickness, m frame was freshly painted and I installed it with the install blocks and a suction cup. push it down good and it never leaked and the trim just snapped back down and was snug.

the A-bodies though, they are another story. messy messy with that gasket

Just had the back glass installed in my 68 Roadrunner with the Window weld tape..
The installer used the primer before the tape.. On the car only, not the glass.

Just had my rear window replaced last night (same glass not new) and yes they did use primer on the glass! 1969 Road Runner...

The installers I used said the butyl tape does not meet the roll over standards, and that's why they never use it. That eliminates, some liability issues for them.

Considering the butyl ribbon was used originally,I wonder what roll-over standards were in place in say 1970 ??? ...Anyhow...The original factory butyl strip had some type of cloth backer facing the interior side of the glass so it would'nt stick to the interior parts when installed...I've never come across any of that stuff for sale...Just as others have said...Use the primer on the car's channel, install the butyl strip {in a warm enviroment}...Then use the urethane around the channel to seal the deal...You need to fill the channel so water does'nt lay under the trim...Or you'll have spots like the back lower window channel rotting out just like they did originally...

What size Butyl tape for a 73 Roadrunner ???? does anybody have a list of which sizes fit which cars ?? Or are they all the same ??

I've got a question about the primer - 3M says don't use if opened for more than 7 days as could be contaminated. My bottle was opened, used once and resealed a couple months ago, looks and smaeels fine, supposedly the 125ml bottle is good for 20-25 windshields so .............. is the 7 day thing for liability reasons because who sets 25 windows in 7 days ? As stated - mine looks and smells like it did when first used.