What is the most durable compatible glaze that wont turn sticky on the clay? Polymer clay doesn't react well with most finishes that are petroleum based. Water-based varnishes cause no interaction with the clay. There are two spray brands that will work on polymer clay, too. They are Carnival Arts Ultraglaze and Krylon's Matte Spray Coating. Both need to be sprayed on in a very light single coat. Even some nail polishes stay sticky on polymer clay, so always test before you coat a finished piece of clay work. Polyform bottles an acrylic glaze in two finishes (Gloss and Satin) that is compatible with all polymer clays. Do not apply too thickly, however, as it can peel. Thin slightly with water. Apply 2-3 thin coats rather than one thick one. Do not use most spray glazes as they can ultimately turn sticky due to interaction between the propellant and the clay. Blair brand Spray Glaze is compatible if used thinly. Flecto Varathan is the best glaze by a consensus vote among polymer clay artists. The name brand is "Varathane Diamond Wood Finish--Interior". The product number for gloss is #2000. It is available in pints and quarts. It was formerly marketed under the brand name of Flecto Diamond Varatane. This glaze does not peel and does not turn sticky over time as many other glazes and sprays do! Future Floor Wax (applied with a Q-Tip or brush) is another economical option for a medium shine that also dries quickly and is compatible with polymer clay because it is an acrylic product. Use only acrylic or alcohol-based varnish on baked polymer clays. Do not use polyurethane, enamel or oil based varnishes which will never dry properly. Baked polymer clay does not need varnishing unless you want a shiny surface (use gloss varnish) or to protect paints or powders applied to the clay.