Note: 1. Skateboarding is the most waterproof. As soon as the board gets wet, the wood will bubble and expand and lose its elasticity, and as soon as the sandpaper gets wet, it will lose its sand seriously.

2. As soon as the board gets wet, the wood will bubble and expand and lose its elasticity. As soon as the sandpaper gets wet, it will lose its sand seriously. Bearings and bridge nails are easy to rust when exposed to water.