Starboard is a polymer "marine lumber" that is made by the Taco Plastics corporation. It is often used on boats to make pieces that are exposed to the elements and it doesn't really require any maintenance.
I would not use starboard as a backing block for two reasons. First, I don't think it has the compressive strength tha marine plywood has. Second, it is very "slick" material, and you can have some issues getting sealants to stick to it properly. Some sealants, particularly the polysulfide based ones will attack the material as well.
You can get it at many marine chandleries, like West Marine, but be prepared to pay through the nose for it. An alternative source for it is your local sign supply wholesaler. That's where I've found it at much more reasonable prices. However, you generally have to buy a half or full sheet of the material.
If you use epoxy... coat the epoxy thoroughly with epoxy, after drilling all the holes for the various fasteners you're going to use. If you're going to screw the seacock flange to the plywood backing board, instead of through-bolting, which is recommmended, then pot the holes with thickened epoxy, much like you would do for a cored deck.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.
Last edited by sailingdog; 05-08-2007 at 10:55 AM.