Eugene Holtie VIOLIN VARNISH CATALYST 15ml. ムラのない仕上がりの乾燥促進剤(触媒)。 A catalyst is used to hasten curing of varnish. The Catalyst may be needed if your UV box is weak or you do not have intense sun. We recommend using our catalyst, which dries uniformly. Experiment with how much catalyst you add, usually a few drops is enough. Too much catalyst can compromise the varnish. Bottle contains 15 ml of Catalyst.