Diamond 9H is a clear and transparent product, just like water. When bottled the product is in its liquid form but after application cures into a hard, rigid film like glass to protect the substrate permanently. The Diamond 9H hardness test result was 9H, using JIS5400 testing regulations, certified by SGS. Most global car care coating products do not have a real thickness and hardness. The Pencil hardness test is a relative concept with hardness ranging from 1H to 9H, the latter being the hardest.