Original oil-based Kilz is generally considered a superior stain blocker and odor sealer compared to Kilz 2, as its solvent-based chemistry locks in severe water damage, smoke, and tannins much more effectively. On the other hand, Kilz 2 is a water-based latex formula that offers lower odor, easier soap-and-water cleanup, and faster drying times, making Kilz 2 better suited for standard, low-intensity prep work on drywalls.
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