SPRAYER 3.5 GAL CURING COMPOUND. Chapin's oil sprayer is perfectly compatible with most professional concrete and chemical applications. This product has a Tri-poxy tank with a capacity of 3.5 gallons, which protects against rust, corrosion, and damage caused by dents. It is also made up of a reinforced hose with a threaded accessory, a brass pump, wand, nozzle and shut-off with locking feature. In addition, it has a 4-inch mouth opening for easy filling and cleaning.