Yep, you nailed it. Here is more info copy/pasted from the interweb. The stuff is actually called King Starboard and also there are some knock-off brands that may be cheaper and just as good.
Quote:
Original Marine Building Sheet
King StarBoard® is the original marine-grade polymer and the industry standard. It is the product of a proprietary process called K-Stran™, the most advanced manufacturing process available for producing consistently flat continuous sheets. King StarBoard® is environmentally stabilized to withstand the harshest marine conditions. It will not rot or discolor like teak and other solid woods, and it will not delaminate like wood laminates. King StarBoard® is easy to work with using standard woodworking tools, and design changes are a snap. In addition, the installed cost of King StarBoard® is less than teak, other common marine woods, and fiberglass. Plus, our large sheet sizes maximize your yield. Boat buyers appreciate King StarBoard’s® low-maintenance finish. Repair and refinishing due to weathering and decay are eliminated, and cleaning is easy. King StarBoard® has a handsome matte finish on both sides to hide scuffs and scratches that would show on glossy textured sheets or acrylics.
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