These are AMC coasters. They were laser cut and they need a couple coats of lacquer.
Step 1: Items Needed
You will need your material, steel wool, brush, and lacquer.
Step 2: Steel Wool
There is residue from the laser cutter. To remove the residue, you need to use steel wool and go with the grain until the residue is gone.
Step 3: Brushing
When the material is ready, you will brush lacquer on the material. You will have to wait 2 hours, or however long the instructions say on the can. Then you will apply the second coat. Once the second coat is dried you will have a nice finished product.