Slip trailing can be used to create patterns, show decorative skills of the potter, or personalize items. Shake well before using to activate the deflocculant and provide good fluidity, then perforate the tip of the bottle using a needle. Holding your slip trailer bottle upside down with the cap on, shake the slip so that it fills the tip end of the bottle to minimize air bubbles that might cause a break in the slip trailed line. Apply to moist clay for a raised line. Potter's slip may also be brushed on at any stage, but it will need to be thinned with water.