sandblasting numbers/ltrs in natural stone

What type of stencil is required to sand (http://maplered.com) blast numbers/ltrs in natural Stone (http://g603.net) . I have
a compressor and (http://maplered.com) sand (http://maplered.com) blaster rig and (http://maplered.com) would like to put my house number on a
big rock in front of my house. There must be some sort of rubber/latex/plastic stencil and (http://maplered.com) adhesive that can be purchased, but from whom. I would greatly
appreciate any help,tips,info,catalog sources. I was just forced into early retirement by Northrop-Grumman and (http://maplered.com) need a hobby and (http://maplered.com) possibly a source of income. THANKS MUCH, FRED