That stuff is very durable but as it gets older, sits under a tree, is exposed to dirty water, it can start to look pretty bad.
The secret is to understand that undamaged but nasty looking gelcoat can almost always be brought back to nearly "like new" appearance with a little work and the right chemicals.
Here is a good example from the topic where loquinho is restoring his dad's Nacra 5.2.
If you see a beachcat for sale that looks like this

remember that it has the potential to look like this after washing up.

Anyone advertising a boat for sale that looks like the first picture just wants it out of their yard, of course you still need to check everything out and make sure no expensive pieces are missing (and they are all expensive if you have to buy them new) and that the underlying fiberglass is sound.
But remember that a dirty boat is often a great deal.
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Damon Linkous
1992 Hobie 18
Memphis, TN
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