The Marideck 80 ml vinyl flooring is suitable for all installations and is recommended for wood floors and marine plywood floors.  This is because it is thicker and will help to disguise imperfections in older flooring.
Marideck 34 ml vinyl flooring is suitable for aluminum fishing boats, fiberglass boats or for new plywood floors.  It is thinner than the 80 ml, so it is not a good choice for covering floors that have imperfections, divots or valleys.