Zinsser Odorless Oil-Based Stain BlockerZinsser Odorless Oil Base Stain Blocker is a high solids, low VOC specialty primer for interior use when the stain blocking performance of an oil is required, but odor is a concern. Developed specifically for people sensitive areas in commercial and residential environments, the state of the art sprayable formula has even less odor than most water base primers. Seals stains from water, fire and smoke damage Oil base performance when odor is a concern