As said, it's the sun that kills them. Particularly a problem down here under the hole in the ozone layer!
I think it's been scrapped now but a chap I know had a new Humber here and I think it was stored outside permanently, last time I saw it a few years back the tubes had literally lost almost all of the outer layer and there was fabric showing everything - they were absolutely shot. I don't know how old it would be last time I saw it - would guess somewhere in the 10-15 year range. It's why mine lives in the garage!
Interesting to read the comments about fraying threads, I have some hairs around my wear patches and had been pondering whether it was too risky to deal with them!
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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