MTFCA Forum

I am getting ready to install the rear and quarter panel windows in my coupe. They will fit firmly into the frames, actually the rear glass is difficult to get into the frame.

My question is: Should I use an adhesive around the perimeter of the glass on the outside?

I used a little on mine for two reasons. One to make sure it sealed well and two to hold it in place a little while I put the moldings on.

Yes. A small bead of “The Right Stuff” (my preference) or “Ultra Black” black RTV, between the rubber seal and the lip of the steel window frame will not hurt. Don’t use so much that it squeezes out. If a little does squeeze out, you can gently remove it from the glass with a new, very sharp razor after it cures. They make a fast drying type and one that cures in 90 minutes. I prefer the one that cures slowly (pictured), so there is plenty of time to get the alignment right before it sets up. I didn’t use any RTV on mine and the one time my T got caught in the rain, the water leaked passed the rubber seal and made a small puddle in my trunk. My T has only been caught in the rain one time in 52 years, so it is not really a factor with me, but if you intend to take your T out in all types of weather, it could be a factor. I’d say go ahead and seal it while you can, just in case, but still try and keep your T out of the rain. Jim Patrick