Then, it’s off to sanding with 200 and 600 grit wet sandpaper. Slowly, the soldermask is removed and the top copper layer appears. After that, it’s just a matter of sanding and scanning ...
The trick is to use sandpaper. It’s a good quality abrasive material and is readily available. You’ll want a selection of different grits – low grits to get started, higher grits when finishing.
Now we're over at the sanding machine, and we will take this through at least three different grits of sandpaper to remove the large chunks. Now that it's smooth, we can actually go through and ...