Step 9: Sand the piece
Afterwards, sand the piece first with the 120 sandpaper, then with the 360, and finish with the 1000.
I sanded the base only with the 120 and 360 sandpaper, giving it a semi-transparent look.
This is the hardest step so far. I spend at least 4 hour's sanding, just because my mold was very irregular, so take care about that.