Azek PVC plastic decking board is one of the better options. There are 2 brown colors that look reasonable, one is somewhat close to teak. Others have fabbed boat items out of Azek. I found samples at a local lumberyard that sells it, not a the big orange or blue box store. I intend to make treads for my swim ladder, but buying the shortest board for close to $100 is a big pill to swallow… (and a real long board to get home on top of the car
I would NOT buy a composite material like Trex, or whatever it is. This is available at the big orange box store. It is bits of wood molded together with recycled plastic shopping bags. No, I am not kidding you, I saw it on a "how it's made" type TV show, and the company is proud to be recycling the bags. I don't think I'd want that to be a marine grab rail. It would do well as decking material, but I don't know that it has the integral strength for grab rails, or rot resistance for a marine environment.
Plasteak is a high density polyethylene product colored and molded to look like teak. Easy to work with, similar to Starboard. They will make you custom stuff.
Otherwise, look around at chandleries for pre-made teak grab rails and stainless steel. I'd be very careful of a home bathroom grade rail - might not be stainless enough for a salt marine environment.
Brian
Instead of wood how about the plastic decking you can pick up at the local home improvement store. Several colors to chose from, about 1 inch thick and an 8 foot plank should get you all the handrails you need. Makes great rubrails too. A bandsaw and a router would make the job easy.
