Shop for Marineboard HDPE sheets. HDPE marineboard sheet provides superior performance where water, UV exposure, and other harsh elements are present. Unlike wood or metal alternatives, marineboard will not rust, corrode, rot, delaminate, or splinter. Custom cuts and cut-to-size pieces. Have machined into fabricated parts. HDPE comes in many colors. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.