Heat Part A to 80 C. Combine Part B. Heat to 80 C and add to Part A. Add ingredients of Part C to Parts A and B and continue heating for 20 min at 80 C. Replace water loss. Cool to 40 C and add Part D. Aerosol Composition: 96.0% Concentrate; 4.0% Isobutane/Propane 40-46 psig.