Polyethylene (PE) is inert (i.e. the molecular structure is full) and therefore will not rust or corrode and does not suffer from electrolysis.
As polymers are long chain molecules they give plastics a memory resulting in high impact resistance unlike metals or glass which have crystalline type structures that dent or fracture.
PE has a low friction co-efficient (0.02) which results in less drag, making for better performance.
PE is relatively light with an S.G. of 0.92, approx 1/3 the weight of aluminium (S.G. 2.7).
PE will not scratch or damage other vessels or infrastructure. It is lightweight which results in the boat being very positive in the water as it naturally floats. Vessels built of PE can be three times as thick as aluminium for the same weight or built much thinner and lighter.
UV stabilisers can also be added to ensure a long working life.
Vessels constructed of PE do not require coating or painting, and are low maintenance as the PE is inert and therefore has no porosity ensuring that marine growth can not penetrate the polymer. Although marine organisms like to grow on polymer they can not effectively attach or penetrate making them easy to remove and therefore anti foul is not required.
Rotationally moulded PE vessels are limited by mould design and in size by the oven size and typically do not exceed 5 meters.
Fabricated PE vessels are limited only by budget and imagination.