Lapping a New Plate
- Take a ballpoint pen and lightly mark over one face of the plate.
- Place a 12x12" glass plate in the sink, and the 80 grit sanding sheet on top. Turn on the water to a moderate flow, and adjust the temperature to be comfortable.
- Using back-and-forth motions, sand the marked face of the tile until all ballpoint marks are gone. Turn the tile periodically to avoid asymmetric sanding.
- Using very light pressure and a figure-eight lapping pattern, continue until large scratches are removed, and the entire surface is defined by the sanding.
- For the 220, 400, and 1000 grits, repeat this light-pressure, figure-eight lapping process, staying at each grit long enough that scratches from the previous grit have been removed.
- Rinse thoroughly and inspect. The lapped face should have a satin finish and appear completely flat.
- Dry the tile, either at room temperature overnight, or in the toaster oven for about an hour at 150 °F.
Refinishing a Used Tile
Perform steps 4-7 above, starting at the grit suitable for removing the defects. For refinishing small residues or discoloration, performing the final polish at 1000 grit is often sufficient.
Materials and Vendors
|60507||CoorsTek||Porous ceramic plate|
|8476K23||McMaster||Glass plate for lapping, 12x12"|
|4677A69||McMaster||Sanding mesh, 80 grit|
|4677A64||McMaster||Sanding mesh, 220 grit|
|4677A61||McMaster||Sanding mesh, 400 grit|
|6835A75||McMaster||Sandpaper, 1000 grit|