We begin with choosing a 12" X 12" Template that would be used for stenciling. So it has already had the pattern cut out of it where your Etching Cream will go through it onto each of the 9 mirror squares that you'll be using to make the window panes. You lay the stencil on top of the mirror square, tape it (using regular masking tape) to the counter or the mirror square to be sure it does not move. You then use a paint brush and spread lots of the Armour Etching cream on all the emp…