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To make an add-on, all you have to do is select a flat mold or plaster bat and pour the slip on the flat surface. To make an add –on, work the wet clay in your hands like bread dough, folding from time to time to eliminate air bubbles. A few drops of glycerine or warm water will slow the drying time of a piece of clay you are working with your hands to form an add-on. To attach an add-on to a piece of greenware, use liquid clay or slip. It is best to dampen the greenware surface before applying the add-on. Be sure to apply your add-on solidly to the greenware. Any air pockets left under your add-on will make for and explosion in the kiln later.