If you’re working with a small piece of resin and it isn’t terribly dirty, you can also simply dip it in the soapy water to clean it.
Wet sanding your resin will give you a much smoother finish than dry sanding and will also minimize the amount of dust created by the sanding process. Wear a mask or respirator while you sand so you don’t inhale any airborne particles. Be sure to use wet or wet/dry sandpaper instead of ordinary sandpaper. Wet sandpaper is specifically designed to hold up when wet, whereas ordinary sandpaper or dry-only sandpaper won’t work as well when it’s wet.
Make sure all of the surfaces and divots are sanded before moving onto the next highest grit. If you want to achieve an even smoother finish, you can also sand your resin with 2000 grit sandpaper. However, in most instances, you don’t need to go this far in order to get your resin smooth enough to polish.
You can do a simple visual scan to check for any leftover scratches. If you see any, go back and continue sanding your resin until they’re gone. Wet the resin with water to make it easier to see any scratches you missed.
For example, products like Turtle Wax Polishing Compound are also labelled as being effective at removing scratches from resin. You can buy this type of product at most home improvement stores. You can also use an automobile polishing compound.
You can buy a buffing wheel or polishing tool at most home improvement stores and automobile parts stores.
If there’s any haze or compound left on your resin piece after you’ve finished polishing it, use a separate, clean microfiber cloth to wipe it off.
