2000 BULLS EYE 1-2-3 INT/EXT PRIMER ZINSSER 5 GAL | There's a reason RUST-OLEUM ZINSSER Bulls-Eye 1-2-3 water-based primer is our most popular primer. This premium, whole house primer sealer provides outstanding performance indoors and out, with low-odor, great flow and leveling and a flexible, acrylic formula.