Plate processors: Use diluted 1-part gum to 1-part water. On plate by hand: Pour a liberal amount of gum onto a damp sponge or shop towel, and wipe evenly over the entire plate for storage. Dilute if necessary. On metal metering rollers: Clean ink build up off the metering roller, pour gum onto a clean sponge or shop towel and wipe metering roller with a side-to- side motion until entire roller has been treated. Allow to dry before restarting press. A fountain solution additive: Add to pre-mixed fountain solution in increment of 0.25% per litre of fountain solution, to eliminate scum and keep reverses open.