craftgrrl | question and supplier recomendation

i have a glass pane that i want todo an etch thing to but i want to be able to free form it with an exacto knife and was wondering what i need to get to put on the glass that i can cut away pieces for the etching. i dont even know hwat to serch for to find out, anyone that can suggest it would be muchly appreciated.

also i would like to make a recommendation for theringlord.com ive ordered from them for quite awhile and whenever i have a problem they have excellent and helpful customer service, i recently had to contact them because i lost one of my gift certificate codes from Christmas(they dont expire for a year) and they went ahead and rolled all of mine into one code so its easier for me to use(probably easier for their records as well)

i do suggest making large orders however because of how they do their shipping, thay arnt really set up to give good shipping prices on smaller orders.