Which is better, water sandpaper or dry sandpaper?

There are many differences between water sandpaper and dry sandpaper, but there is no such thing as a better sandpaper. The choice is mainly based on the grinding materials and job requirements.

If you want a smoother finish, and you don’t mind the slow grinding speed, it is better to use water sandpaper; if you need to grind a lot of materials and need a faster speed, it is more recommended to use dry sandpaper, or dry sandpaper first. Then grind with water sandpaper.