All floorboards are made of teak plywood. The veneer is about 2+ mm thick, giving sufficient thickness for sanding a couple of times. Originally, the floorboards are just lightly oiled or waxed and attract quite a lot of dirt as well as being quite sensitive to stains from oil etc. Over the years, they had become quite scratched and did drag down the general feel of the interior.
Usually, I only use traditional varnish (Le Tonkinois and International Schooner and Original), but for the floorboards I used International’s 2-component polyurethane varnish Perfection Plus with anti-slip pearls.