Sandpaper grit is what makes it abrasive. Manufacturers grade sandpaper based on the size of the grit, and the grade you need ...

Grit numbers range from 24 (extra-coarse) all the way up to over 1000—though most home improvement projects use sandpaper in a much smaller range, from roughly 60- to 360-grit.

For the most part, you can still use a medium-grade sandpaper grit. 'We would use anything from a 120 grit up to a 220 grit paper for these areas,' says Anthony.

This classic hand-held sandpaper block features 12 sheets of medium grit sandpaper (1 by 4 inches) that are attached to a lightweight pressboard backing.

Summer is DIY season, and if you have some projects planned, you might have noticed that the price of tools can add up ...

Generally speaking, 30-grit and 60-grit papers are used for rough sanding, 100-grit to 150-grit sandpaper is for medium sanding, and 220-grit sandpaper is used for finish sanding.

Medium-grit papers are 80 through 120, used to smooth surfaces and remove small imperfections. Fine-grit papers, 150 to 180, are used for final sanding before finishing wood.

Then dry it with a towel. Use some medium-grit sandpaper and rough up the dented areas. This will help the filler to stick. You will need to buy some filler to fill in the dents.