On 14 Oct 2003 14:01:32 -0400, Almus Kenter
wrote:

You describe the symptom well; it
is as if the plastic melted and has stayed in the melted state.
Don't know what to do about it.

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I've had this happen to older fenders and attributed it to solar UV
damage but don't know for sure. The only cure I know is fabric covers
or chucking them out, otherwise they will leave residue on the boat.