Use this Armour Etch Etching Cream to decorate and personalize glassware and mirrors. Just adhere a stencil to a clean glass surface, brush on the etching cream, and wash off. It works perfectly on finely detailed stencils but is not intended for large solid areas. It does not etch plastic and some Pyrex. Warning: may be fatal or cause permanent damage to skin, eyes, or respiratory tract. Vapor harmful, causes severe burns which may not be immediately painful or visible. Be sure to read all safety precautions carefully. Ages 18 and over.