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I had the windscreen changed on my Carlton recently due to a crack that was growing in size .
This was done by a firm that provided a lifetime warranty but since then they've claimed that
this doesn't hold because of the rust they have claimed to have found.
They backed this up by sending me photos which didn't clearly show the great swathes of rust
that they claimed existed.

I am trying to find out if anyone else has experienced a similar situation.
 

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This is quite normal in an old Carlton, particularly if the windscreen has been changed in the past due to the fact that the protective paint usually gets damaged when removing the old screen, which eventually lets the rust set in. I suspect that it was the build up of rust that caused your previous windscreen to crack.

I had this same thing with one of mine about 12 years ago. The car had a crack running from one side of the windscreen to just within the swept area of the wiper on the passenger side. When I took it to have a replacement screen fitted, the fitter called me over to show me the rust patches that they had found when they removed the old screen. They said that they could sand the rust down and treat it before fitting the replacement screen, which they did. However, I had to agree to the fact that they would not be able to give the warranty that they would normally give in this case because of the rust damage.

The screen lasted until something like a couple of years ago when I found I had a front drivers side carpet swimming in water. At first I thought it was the usual rot hole problem at the back of the front wing, but that was all fine. I eventually found that the windscreen seal had failed, obviously because of that original rust problem, but on the drivers side this time - at least it hadn't pushed the glass up and caused it to crack this time, having just caused the mastic type sealant to come un-bonded from the metal. I had one windscreen fitter look at it and he wouldn't touch it, he said that due to there being rust, probably bad rust, underneath it, that if he removed the screen then he wouldn't be allowed to put it back due to various safety regulations. For a temporary measure and to keep the car on the road, I taped all round the screen with masking tape covered over with gaffer tape to keep the water out, and having dried out the carpet, I removed one of the rubber plugs in the floor and cut a metal plate to fit under the carpet to stand it off the actual floor itself, so that any water that might get in, would run straight out without wetting the carpet again. This worked well for about a year with no more water leaking in, although I did have to replace the tape a couple of times until I took the car off the road at the latter end of last year and put the old blue one back on the road, as that one doesn't have a leaking screen seal problem.

I personally think you should be very thankful that they actually fitted your screen and didn't refuse to do it after having found the rust, and left you with a car without a screen to take away with you. My advice would be to keep quiet about it and hope the screen and its seal outlasts the car - mine lasted another decade before causing problems. If you wanted to spend a LOT of money, you could take it to a professional body shop and get them to remove the screen and deal with all the rust by rebuilding/replacing the rotten metal underneath the screen. I'll probably end up dealing with mine myself this coming summer if I can get the screen out in one piece - you can get the sealant/bonding compound on ebay for around fourteen quid. I think the screen will probably come out quite easily now, as I don't think there's an awful a lot holding it in anymore - we'll see.
 

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I think the warranty is against any leaks.
 

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Or cracks not caused by external damage. Had the screen changed on the previous Tigra B, due to a crack that started at the bottom & worked it' way up, for no apparent reason. I was presuming it was caused by the body flexing, being an convertible. Autoglass gave us a lifetime guarantee from this happening again.
 

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If its rusted under the rubbers, doesn't that mean they never sealed it properly the first time it was changed.
Thing is the windscreen is part of the cars structural strength ( around 30% ) so it needs to have good metal to bond to.
 

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It's a good point about whether the windscreen was sealed properly the first time it was changed. What I've noticed with the Carlton is that if they either have the original factory windscreen still in place or they've had a replacement fairly early on in their life then they seem to have no problems with the seal, it's the ones that have windscreens replaced later in life that seem to suffer the issues. My theory is that the paint on the metal gets damaged when it's cleaned up to accept the new sealant, and then if it's not applied well enough to cover all the metal area, the wet gets under the edge and eventually causes corrosion, probably from condensation on the inside as well as rainwater from the outside, but this is just my own personal thoughts on the matter and I've no hard evidence.
 
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