Both companies use similar application processes to bond the nano-polymers to phones. They place the devices, or their internal components, inside a sealed chamber, vacuum the air out, and inject a carbon-based gas. The vapor settles on the object and solidifies in a transparent layer that's one thousandth the thickness of a human hair. When water hits a protected surface, it beads up and rolls off. The main difference between the companies is what they protect; HzO treats only internal parts, such as processors and sensors, whereas Liquipel coats both the interior and the exterior. In HzO's tests, a treated iPhone survived underwater for more than four hours.