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Before we get started, I should talk a little about the different types of sandpaper that there are available to you, the consumer.

When we talk about sandpapers we are really talking about a wide assortment of backers with different abrasives attached with a variety of glues or bonding agents. It's a lot of variables! Really, the mind kind of boggles at the wide assortment these combinations bring about.

For backers we have, of course, paper. But besides paper we utilize some sorts of cloth, PET film, fibre, or rubber. The glues are generally hide glue, but for waterproof sandpapers they will use a resin bonded onto a waterproof backer. The actual abrasive (the sand part of sandpaper) can be glass, garnet, aluminum oxide, or even diamond.

Grit is, of course, how rough the sandpaper is. The finer you want, the higher the number. Sixty grit is very coarse, and 10,000 is super fine.

Now that we're all on the same page, let's talk about garnet sandpaper.