Rinse the aluminum soffits using a pressure washer. Allow the soffits to dry for 24 hours.
Protect surfaces adjacent to the aluminum soffits by covering them with painter's tape. Protect patios, sidewalks and other surfaces below the soffits with drop cloths. Be meticulous or stains may result.
Affix a bucket hook to your 5-gallon bucket. Pour two gallons of metal etching primer into the bucket. Scale the ladder and use the hook to affix the bucket to the side. Coat the aluminum soffit with etching primer using the roller. Roll vertically. Use a polyester brush to smooth the fresh etching primer, as this will promote a smooth finish. Continue this application process until the entire soffit is primed. Wait two hours for the soffit to dry.
Wash the roller frame and polyester brush with water.
Paint the aluminum soffit with acrylic latex paint using the same methods as when applying primer. Wait two hours for the soffit to dry.