or fading

"Glass Fibre is prone to osmosis!
For detailed information see pages 36–40.
Gelcoats fade!
Eventually the gelcoat will begin to fade"

and:
materials may fatigue
- possibility of osmosis
http://www.windpilot.de/en/Se/Yacht/materien.html

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Note added at 1 hr 23 mins (2005-02-07 14:21:03 GMT)
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ósmosis ...