Duratec Surfacing Primer is the best choice for coating your plug or reconditioning your mold.Thin 5%-15% if necessary to a desired spray viscosity with #2306 Duratec Thinner after catalyzing. This surface primer can be applied as heavily as 45 mils to fill fabric pores on plugs or over repairs. With a higher heat distortion temperature, shrinkage is reduced. This further hides the repair.The gray primer sands easily and is then buffed to a Class 'A' mirror finish before building the mold. Requires 2% MEKP.