Hot Rods Windshield Replacement

I am getting ready to replace the windshield(s) on a 1939 Nash. Their tech manual says to insert the rubber, insert the glass, and then use glue between the rubber and the glass (outside) and also glue between the rubber and body. What do you guys use for "glue"? Does anybody just use urethane like the newer cars? Thanks

 

3M black windshield urethane. Comes in a caulking tube. Very messy but you can clean the mess up with turpentine. If done thoroughly, that stuff will NOT let the water through.

 

^^^This^^^

The mess can be mitigated by masking the heck out of everything, using gaffer tape to mask on the rubber.

 

Thanks for the quick replies!
is it correct to install the glass in the rubber, then apply the 3M in the channel against the window---and then around the out side lip? Thanks

 

Be aware that once that urethane sets up, you will play hell ever getting that gasket separated from either the glass or the metal. I you ae good at it, then go for it. The old school way is to use the following liquid butyl rubber. You can install the glass and rubber, then apply the sealant to the pinch weld and under the lip of the gasket with the small nozzle. Install any hardware after clean up.

It cleans up easily with mineral spirits or grease and wax remover. Masking is always recommended.

https://www.amazon.com/dp/B000K40PGA?ref=ppx_yo2ov_dt_b_fed_asin_title
https://www.amazon.com/dp/B00MYI2GX0?ref=ppx_yo2ov_dt_b_fed_asin_title

 

I prefer the butyl also. the urethane never comes off.

 

Anything

 

The rubber is so old that it melted and then hardened again. It was hard to get the trim off the inside. But the metal body edge was pretty much clean on the outside. Looks like it didn't have any stickum on it. Thanks for the pointer on the butyl. I never changed out one of these old windshields. I wish I had some idea on how this meets up with the center post. It does have a rubber channel sandwiched between metal, but how is it sealed up to the rubber moulding?

 

LOL

 

On my 37 Nash, I just used sealer between the body and glass, I didn't have any old rubber to utilise..
I made 4 small hooks to hold/locate the glass while the sealer dried ( allowing an inch either side of the hooks to have no sealer)
When the fealer had hardened off, I carefully removed the hooks and sealed over the gap..
One helpful hint.. Apply masking tape to the outer body and screen surface, then when the sticky mess is installed, just peel off the tape, makes clean-up real easy.

 

A glass guy explained urethane to me. The usage came about as a safety thing, it keeps the windshield from coming loose in a crash.

Personally, in a car of that age, I wouldn't use it.

 

A caution here:
While I was On the road ( long haul ) the Mrs cracked her windshield. ( 2 yr old car )
Some guy installed new glass. I suspect ( from reading up ) he used silicone.
Four years later the A pillar went rotten.
Do NOT use that stuff

 

Some RTV's use acetic acid to help them cure. That acid is really corrosive to metals.