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sealing a windscreen in a 1957 Fiat Abarth 750 GT Zagato

I am hoping to get some advise on the type of material to use to install a windscreen, with semi waterproof results, into a Fiat Abarth 750 GT Zagato.

The car is aluminum over a real basic steel tube frame. The windscreen was originally installed from the inside so it pushes up against the hole in the body, and it floats on 8 small sheet metal brackets held to the inner side of the body.
Because the body is hand made (on a tree stump), the inside finish is not a flush mount to the glass. And because the alloy body flexes with every movement of the car, the glass cannot be glued to the body becoming a structural member, or it will break. I know this from experience.

The original sealing material was a thick black goo, with a consistency similar to chewing gum. Of course the 60 year old material was done, and cannot be reused.

The company I buy most of my glass installing materials from originally suggested power bond hi-viscosity urethane, but i feel if i use this product the glass will quickly be broken.

Can anyone suggest a product, and where to buy it?

Chris Obert

Re: sealing a windscreen in a 1957 Fiat Abarth 750 GT Zagato

use Liquid butyl that sounds like what was used.
it may stress if you use something ridged if the body flex is as described.

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