Spray Procedure: The primer (SRB-133) may be thinned for spraying with a 1/1.5 mix of MIBK/Toluene. The topcoat may be thinned with a 1/2 mix of MIBK/Xylene. To attain the proper "pebble" effect with the topcoat a pressure pot spray apparatus should be used. Satisfactory results are possible using 40-80 psig on the spray gun and 18-25 psig on the pressure pot. The paint/air ratio should be kept as high as possible.