Faith Over Fear Inspirational Ceramic Tile Decor with Cross

First you will need to clean all grease and fingerprints on the areas you want to engrave. I used a good dish soap and let dry.  Next, I used rubbing alcohol to finish.   Let this dry before you put your batch coatings on.  Now mix up your first single batch of coating using 1 part titanium dioxide powder and 2 parts liquid chalk.  It is very important to add food coloring to each batch.  I used 8 drops of blue and 8 drops of red food coloring.   Using your wax brush, put your first coat on and let it dry thoroughly.  After first coat completely dry, mix up your second batch and coat your tiles again.  I used 1 tsp measuring spoon.  Each batch will cover about 8 of these ceramic tiles. After completely dry, setup your tiles in a jig.  This helps in doing multiple parts and easier setup.  Please note the program has 2 sets of engraving setup in layers.  You can run them both at the same time.  Lettering will be scored and followed up with engraving the inside of the letters.  There is a high chance this process will work on glass.  As of this writing, I have not had a chance to try.  Please let me know if this helps you.  Have fun with this.