Uploaded April 2026 | Updated September 2026, 2 weeks ago
How to polish agate to a mirror finish on a flat lap grinder—this step-by-step lapidary polishing tutorial shows the exact grit progression to remove scratches and get a glassy, reflective shine. Learn the Sharpie grid trick for flatness, then finish with a felt pad and aluminum oxide for a true mirror polish on agate.
If you’ve ever hit that “almost shiny” stage but still see dull spots or mystery scratches, this workflow will help you diagnose exactly where they’re coming from and fix them before you move on.
In this video, you’ll see:
Low-speed flat lap technique (let the diamonds do the work)
Why the Sharpie “map” reveals low spots instantly
When to move on vs. when to stay on a grit
How to keep your finish clean (including the distilled water tip)
Tools & consumables used (as shown in the video):
Flat lap grinder with speed control
Diamond discs: 80 grit, 180 grit
Pre-polish/polish pads: brown, red, blue
Felt pad + aluminum oxide polish
Distilled water spray bottle (helps avoid mineral spots)
Black marker for the grid (Sharpie-style)
Safety glasses
Drop a comment with what stone you’re polishing next—and if you try the Sharpie grid method, tell me if it changed your results.
00:00 Perfect Agate Polish Start
01:09 Flat Lap Setup Guide
02:06 The Sharpie Polish Trick
03:49 80 Grit Shaping Step
04:41 180 Grit Scratch Fix
05:40 Pre-Polish Pad Method
06:38 Mirror Finish Final Step
07:57 Glassy Agate Reveal
#Willorocks #lapidary #flatlap #rockpolishing #agatepolishing #lapidaryarts
How to polish agate to a mirror finish on a flat lap grinder—this step-by-step lapidary polishing tutorial shows the exact grit progression to remove scratches and get a glassy, reflective shine. Learn the Sharpie grid trick for flatness, then finish with a felt pad and aluminum oxide for a true mirror polish on agate.
If you’ve ever hit that “almost shiny” stage but still see dull spots or mystery scratches, this workflow will help you diagnose exactly where they’re coming from and fix them before you move on.
In this video, you’ll see:
Low-speed flat lap technique (let the diamonds do the work)
Why the Sharpie “map” reveals low spots instantly
When to move on vs. when to stay on a grit
How to keep your finish clean (including the distilled water tip)
Tools & consumables used (as shown in the video):
Flat lap grinder with speed control
Diamond discs: 80 grit, 180 grit
Pre-polish/polish pads: brown, red, blue
Felt pad + aluminum oxide polish
Distilled water spray bottle (helps avoid mineral spots)
Black marker for the grid (Sharpie-style)
Safety glasses
Drop a comment with what stone you’re polishing next—and if you try the Sharpie grid method, tell me if it changed your results.
00:00 Perfect Agate Polish Start
01:09 Flat Lap Setup Guide
02:06 The Sharpie Polish Trick
03:49 80 Grit Shaping Step
04:41 180 Grit Scratch Fix
05:40 Pre-Polish Pad Method
06:38 Mirror Finish Final Step
07:57 Glassy Agate Reveal
#Willorocks #lapidary #flatlap #rockpolishing #agatepolishing #lapidaryarts
