Gray, aerosol product expires approximately 36 months after the manufacturer date on the can once activated, the life is approximately 4 days uses innovative packaging to allow Spray Max aerosols to have more yield, faster work speed, and a broader spray pattern than conventional aerosols. The results professional paint results as with a spray gun, but without the disadvantages. No paint mixing, no cleaning of the spray gun, no thinner for cleaning, no compressor, less overspray. Patented technology only from KWASNY. After activated epoxy primer will last approximately 4 days. Spray Max epoxy primer has excellent adhesion and anticorrosion properties and can be used on zinc-coated steel, anodized aluminum, hot-rolled or cold-rolled steel, fiberglass, and many other surfaces. Preparation properly clean and sand with 180 grit for bare metal surfaces to be primed use a good quality grease and wax remover before priming apply 2-3 coats of product and allow 5-10 minutes between coats. after drying approximately 12 hours dry time lightly sand the surface before recoating with a topcoat or another primer salesman notes Spray Max aerosols work much like a conventional spray gun they have high transfer efficiency, and great atomization.