Firing range: Cone 019 to 015. Test for optimal results. We recommend a dedicated brush for metallic luster. Apply with a very clean brush over a smooth glaze fired to maturity (for high shine apply over high gloss glaze) observing health precautions as noted on product package
Mineral spirits are recommended for brush clean up
Luster application is a skill technique. As with any product - test, test, test before applying to a masterpiece