Butyl or Urethane?

[70 Challenger Lover]

Those are good points. I like the idea of safety but most important to me is I want a really good seal. When I've used butyl before, it seems there is always some low spot is doesn't quite mash into.

I may try 1 Wild RT's idea of putting it in with butyl and sealing around the perimeter with urethane. I do want a clean look on the inside and having never used urethane before, I'm sure I will be messy.

[RUNCHARGER]

Good point on the appearance Kawa. That's something I've noticed before as well. I have used Wild's method of shooting the sealer in sideways after the tape (usually when I couldn't get a total seal with the tape) and it is very effective and easier than you would think.

[GoodysGotaCuda]

I went with Butyl more-so to get the proper thickness for the trim, but I do hate that it's always tacky and kind of a pain if you try to clean the corners of the glass or use a sunshade.

For my  , it'd be a high modulus urethane all the way. I've actually seen guys kick old school butyl installed w/s's out of a car and the idea is to retain you inside the car- not out on the road in front of it. 

I'm pretty sure the idea is to have the seatbelt keep you in the car and the windshield keep the wind off of your face. 

[Shoooter]

 My glass should be here any day and I'll be going with butyl. If you are using urethane you have to have your trim ready to go on, with butyl all you have to do is put the car put in the hot sun for a few hours and you can get it to push down and pop the trim on

[HP_Cuda]

I went with Butyl after I had my glass installed by some bozos who used urethane and pressed the drivers side down and left the passenger side alone which made me pull the glass as it looked horrible. Butyl provides for a clean even look and is done right the first time and if you are really worried about safety then do what Wild said.

Look if you get into an accident where the front windshield is a concern you are already rolling the dice.

[70 Challenger Lover]

I kind of like 1 Wild RTs approach. The butyl will get the height and position right plus have a clean look from the inside. A 45 degree thick black of urethane around the perimeter should give it some better sealing. I'll just make sure to keep the urethane away from the trim clips so I can snap those in nicely later when I'm ready.

[anlauto]

Are you sure about the trim clips "snapping on " ? All the 70's I've restored the trim clips screw on and they are impossible to install with the glass in place. 

[70 Challenger Lover]

Yes you are right. I will definitely screw them in before setting the glass. I just need to make sure I don't clog them up with excess urethane.

[Shane Kelley]

I debated this when I built my car. I went with the correct shape and size butyl. I wish I had used urethane instead. Here's what I'm seeing after the car has sit in the hot sun at shows. The butyl is squeezing out in some places where you can see it through the glass from the outside. Also some of the corners the glass has sunk down some so the trim isn't as tight fitting to the glass like when I first installed it. The worse area is the lower windshield has sunk where the fat trim covers. Now I have a gap between the trim and the windshield.  With urethane once it's set up that's it. no changes.  It's nit picking I know. But it still bugs me. 

[70 Challenger Lover]

I debated this when I built my car. I went with the correct shape and size butyl. I wish I had used urethane instead. Here's what I'm seeing after the car has sit in the hot sun at shows. The butyl is squeezing out in some places where you can see it through the glass from the outside. Also some of the corners the glass has sunk down some so the trim isn't as tight fitting to the glass like when I first installed it. The worse area is the lower windshield has sunk where the fat trim covers. Now I have a gap between the trim and the windshield.  With urethane once it's set up that's it. no changes.  It's nit picking I know. But it still bugs me. 

I suppose using both should keep the glass from shifting later

[YellowThumper]

To throw another issue out with this debate.
Reading "my windshield should arrive" tells me you are getting a new one. If going with butyl I would confirm new windshield fairly closely conforms with your opening lip. If it is way off, you will never get it all to seal.
Urethane will fill gaps and seal regardless of variations.
Or as wild stated. Still use both.

[70 Challenger Lover]

I ordered a new windshield months ago when I was doing the metal work to ensure everything went in nice. It does. I'm looking forward to getting the glass in. I am painting next Tuesday and then I can put the headliner in.

I want the vinyl top back on this car. I'm wondering if I should get that on too before putting the glass back in. Would putting the vinyl top on later be that much harder with glass in?

[1 Wild R/T]

Definitely stretch the top first...

[anlauto]

Would putting the vinyl top on later be that much harder with glass in?

next to impossible 

[70 Challenger Lover]

Glad I asked!  I'll do the headliner and vinyl top first.