Patios, decks and paths you stride along without a second thought in dry weather become a serious risk for slips and falls when wet. Inside, polished wood, tiles and vinyl flooring can also send you flying if they get wet. We measured the grip levels of indoor and outdoor anti-slip products, including paint, coatings, and stick-on grips, along with a few concrete, timber, vinyl and tiling products. See our table below for how the products did when tested in a laboratory using a rig that simulates a shoe walking on a surface.