Trouble sealing a Ruby windscreen

[Denis Sweeney]

I fitted a new seal on the windscreen of Ruby about 3 years ago and at the time all seemed good, but the rubber no longer has any resilience or elasticity and now no longer seals the gaps around the screen, there is a clear gap virtually all the way around but is particularly bad in each of the four corners.
Searching back to the previous Bravenet days of this forum where there were posts with pics showing exactly the same problems that I have now.
Has anyone else had this problem in recent times and if so has anyone come up with a suitable solution??
Cheers