Here is an example of composite I used for handrails and stuff.
You can see that it is a little more flexable than real wood when in the hot California sun in long lengths.
It has be sanded with 600 and stained and sealed and coated with two coats of spar varnish.
It is going on two years now and it still looks ok.
I do keep a tent tarp over it when docked in the driveway just to keep the pine needles and palm seeds off of it.
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Originally Posted by sailingdog
Be aware that the composite decking material usually has some wood byproducts in it, and as such can get moldy in a wet environment. It also isn't as rigid as the real wood would be.