As its name implies, SOFT99 Water Block Wax is formulated specifically to deliver maximum water repellency. It achieves this using a waterproof resin suspended in a synthetic petroleum-based paste, which cures to form a durable layer of protection that is extremely hydrophobic (water-hating). As a result, rainfall and rinse water bead up and roll off almost instantly. This extreme beading not only looks good, but also tends to pick up and carry away fresh contaminants, which in turn makes routine washing easier and safer. In addition to these benefits, SOFT99 Water Block Wax also produces a sharp wet-looking shine and provides excellent protection against the elements for upwards of four months per application, even on daily drivers. As is often the case with Japanese last step products, two different versions of SOFT99 Water Block Wax are available (dark and light, for darker- and lighter-coloured cars respectively). The difference between them, however, is very subtle, and it's perfectly safe to experiment with either version on any given car if you wish.