Which different types of sandpaper are suitable for which different grinding scenarios?

1.Coarse-grit sandpaper (around grit size P80 to P120):
This kind of sandpaper has big abrasive grains, so it's got strong grinding power. It's good for heavy-duty sanding jobs. Like getting rid of thick rust and old coatings on metal parts, or making the rough surface of wood smooth real quick at the beginning of woodworking.

2.Medium-grit sandpaper (about grit size P150 to P240):
Medium-grit sandpaper is like a bridge between rough and fine sanding. It's used to make the surface even smoother after the first rough sanding and get it ready for the next steps. When working with wood, this type of sandpaper is often used to make the surface better before painting or staining. It's in the middle between rough and fine, making sure the sanding goes smoothly.

3.Fine-grit sandpaper (around grit size P320 to P600):
Fine-grit sandpaper has tiny abrasive grains and does a really fine job of sanding. It's great for the last step of making the surface super smooth. Whether it's getting rid of small scratches from before or making wooden furniture shiny, fine-grit sandpaper shows how good it is at this delicate work.

4.Extra-fine-grit sandpaper (with grit size over P1000):
Extra-fine-grit sandpaper is amazing at polishing. It's the first choice for high-precision sanding and polishing. It's used a lot in things like fixing car paint and working on the surface of precise instruments. It can get rid of tiny flaws and make the surface as shiny as a mirror.

5.Wet sandpaper:
The special thing about wet sandpaper is that you need to use it with water. This helps lower the heat from rubbing, cuts down on dust, and makes the sanding better and the surface nicer. It's used a lot for sanding hard and brittle stuff like glass and ceramics, and for fine work on metal surfaces. Using wet sandpaper is like adding a bit of gentle moisture to the fine work, making the sanding process easier and better for the environment.

6.Dry sandpaper:
Dry sandpaper is the most common type. You can use it right away without anything extra. It can be used on all kinds of materials from metal to wood, and for different stages from rough to fine. Its flexibility makes it the favorite tool for a lot of craftspeople and DIY lovers. It's really useful whether you're doing home repairs or professional making.