When launching from a dock or launch system, you usually don't have to worry about your kayak scratching against anything during launch. However, if you launch from the shore, be careful when moving your kayak into the water. Some kayak materials, including rotomolded polyethylene and thermoform, are typically impervious to this type of damage. If your kayak is inflatable or composite, though, be very careful not to drag it against the rocks and pebbles.