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6 cyl Bristol cars Type 400 to 406 - restoration, repair, maintenance etc

Bonding in a 401/403 Rear Screen.

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Old 21-07-20, 03:10 PM
Join Date: Mar 2009
Location: West Wales.
Posts: 332
Default Bonding in a 401/403 Rear Screen.

I am not that far off needing to refit the rear screen in one of my 401, I phoned my local car painters and as luck would have it a local mobile windscreen specialist was due in and he popped round later to look at the job.
Firstly he did not think the glue they use would grab the glass, it would have to be supported by the frame and secondly he had concerns about the glass itself as it does not have the modern etched strip around its edge which helps the glue stick better to the glass. His major concern however was the lack of the black enamel strip around the edges of the glass which protect the glue from the effects of the suns ultraviolet rays which would melt the glue if it was not there.
Thinking about this afterwards however I did wonder if this might not actually be an issue as the glass is fitted from the inside and the lip of the body is going to shield the glass along the perimeter where it has been glued in place. The screen fitter thought the bonding material may fail after about a year and the screen start to leak.
He suggested as an alternative that it simply be sealed in place on a bead of high quality black silicone.
I have read in the past comments about bonding the these screens in place using modern adhesive sealer's but have seen no follow up of how effective these were after a few years use and what adhesives were used.
Any advise would be much appreciated.
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Old 21-07-20, 04:41 PM
Join Date: Sep 2010
Posts: 200

When I fitted my rear window I sealed it with the same black mastic I used to seal the front window rubber seal. I also put a small amount around the bottom of the body to stop water pooling and seeping down between the body and glass into the wooden frame.

I'm not sure glueing the glass to the body would work or be a good idea.

The main problem was the bottom of the frame had rotted and needed replacing.
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Old 22-07-20, 08:27 AM
Join Date: Jul 2008
Location: Kings Langley, Herts
Posts: 60
Default Bonding of Aerodyne rear window

The Bristol Aeroplane Company used 50% DumDum mixed with 50%of Bostic C
which worked very well. However, I am not certain if these products are still available now, but there are several modern means to fix the window into place
but they need to be flexible to cope with the expansion of the aluminium against the glass.
An extra piece of information which you will not find any where else is the part number of the wooden filet which holds the glass in position, it is N 705712A, there may be a drawing in the archives with sizes. This was supplied oversize and had ro be fitted first to the aperture and then to take the aluminium surround plus the roof lining which is trapped between the two.
I hope this is of help, so the best of luck.
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Old 22-07-20, 03:08 PM
Join Date: Mar 2009
Location: West Wales.
Posts: 332

I think perhaps using a bonding type material rather than a sealer may not be a good idea especially as the original mix was flexible.
I was very lucky to have an original wooden frame made by Bristol and bought many years ago and even luckier that Dave Ralls who has done some trimming work on my cars was able to make up a jig to reproduce them. Made in the same was as the original the only departure is that after realising that most of the adjustment, as they were made oversize originally,is on the inside of the frame is that Dave makes them in two pieces with a small number of the inside laminations separate to reduce the amount off work if the inner alloy frame is larger than average, I have four of those alloy trims here and none of them are the same size or shape though reassuringly all the frames are a snug fit in the surround in the body. If anyone needs his contact details please let me know.
Going back to the sealants there are a lot of choices on the market and perhaps asking one of my friends who used to have an ocean going trimaran might be an idea as there would have been sun movement and salt water thrown into the mix.

Last edited by Geoff Kingston; 22-07-20 at 10:46 PM.
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