Birth of a Retainer: Step 3

So as soon as I get the retainer smooth and ready for the design I then draw the design on the actual retainer with a pencil (regular or white colored pencil depending on the color of the acrylic) after that I choose what size bit I want to use in the hand piece. I then grind in the design about 2-3 millimeters down though the retainer, with out going though the other end. As soon as that is done I then brush it off with a tooth brush and wax it down to the model so that no acrylic seeps i in-between the model and the retainer itself. I then mix the color I need to fill in the body of the design and pour it in. Take the model and place it in the presure pot again. -----Erik