What sander and polishing compound should I use on cured epoxy?

We don't recommend a specific sander, pad or polishing compound. Any sander works, orbital or square palm, because the goal is a clean, scuffed surface for a fresh flood coat of UltraClear Bar & Table Top Epoxy, not a polished finish. The new coat cures to a high-gloss, glass-like finish on its own, fills in the sanding scratches, and is the most reliable way to restore the shine after sanding or planing.

1. Sand. To remove bubbles or flaws, start coarse and finish with 200–300 grit. To scuff a cured coat for re-coating, 220 or 320 grit is enough; within 4 to 10 hours of the previous pour, no sanding is needed. 2. Clean. Wipe off every trace of dust with a clean, lint-free rag and denatured alcohol or acetone. Do not use paint thinner (mineral spirits). 3. Re-pour a flood coat over the entire surface.

For a few small spots you can brush on a tiny fresh batch with an artist's brush (dip from the center of the cup so it's fully blended), but a smooth result isn't guaranteed.

Polishing epoxy is difficult and at your own risk. Some experienced customers have had success with 3M Finesse-It II, a high-gloss polishing compound, but technique is critical: too much speed smears or softens the epoxy, too little leaves it cloudy. Test on a small, inconspicuous area first.

Bar & Table Top Epoxy Instructions: https://cdn.shopify.com/s/files/1/0320/7168/0140/files/Epoxy-Instructions.pdf?v=1616443869