1.5 pounds (680g). By volume, mix 1part powder to 4 parts water. Mix thoroughly. Apply primer evenly to the shel with a wide soft bristle brush, horizontally and vertically 4 or more times. Cure primed shelf in the kiln at a minimum of 550F (288C) vor a minimum of 20 minutes.Primer is color coded. Color will disapear at slumping or fusing temp. Complete instructions on each container, kishprfglkih Kiln Shelf Primer 5 pounds shelfprimer5$29.00 Kiln Shelf Primer 1.5 pounds shelfprimer1$15.16