If you're looking for an exterior primer then Amazon has a nice selection. Available by several brands like Hammerite, Kilz and Convenience Products in a latex exterior primer, traffic paint, galvanized and aluminum primer, stain blocker and a OilStain Remover. All painting tools, supplies, paint, stain and solvents are available in a variety of sizes and prices to make your house painting easy and durable. W35W00716-20 Do it Best Latex Exterior Primer
Our finest exterior latex primer for use on bare or previously painted wood, plywood siding, galvanized and aluminum metal, vinyl siding, cement composition, stucco, masonry, and block surfaces. Helps prevent cracking and checking of exterior plywood. 
HAMMERITE 48300 GALVANIZED & ALUMINUM PRIMER SIZE:QUART.
- Interior/Exterior - Galvanized & Aluminum rust inhibitive latex primer. - Drying: Dries to touch in 1-2 hours. Allow to dry 24 hours before applying finish coat. - Adheres to Galvanized Metal, Aluminum, Tin and other metal surfaces. - Color: Gray - Size: 32 Fl. Oz. (1 Quart) - Coverage: 350-400 square feet per gallon 
the exterior paint primer is found at amazon.com
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