Spray tanks and cups are vessels that hold paints or coatings for use with spray guns, applicators, and atomizers. Some devices are pressurized. There are several basic types of products. Gravity-fed spray tanks and cups are top-mounted vessels that use the force of gravity to feed paint, fluids, or coating powders into handheld spray guns. Pressure pots are pressure-fed vessels that use compressed gas or air to force the flow of material. They often include an integral regulator to maintain the required pressure within the liquid coating or paint. Suction-fed or siphon-style spray tanks and spray cups use a fast-moving stream to create a vacuum that pulls materials into the stream. They attach directly to the spray gun and are bottom-mounted. Rotary cup applicators and rotary cup atomizers spin rapidly to project powders or atomize paint.
Product specifications for spray tanks and cups include capacity, disbursement method, media, materials of construction, height, weight, diameter, maximum input pressure, and number of outputs. Spray tank or spray cup capacity is measured in metric units such as liters (L) or English units such as quarts (qt.) and gallons (gal). Two-quart spray cups are used for small batch jobs and fast color changes. Larger 2-gallon spray tanks are designed for pressure-fed applications. Typically, spray tanks and cups are used with paints or coatings such as varnishes, lacquers, stains, acrylics, adhesives, foams, and polyurethanes. Metal spray tanks and spray cups are made of forged aluminum, stainless steel, or galvanized steel. They are often galvanized or polished electrostatically. Plastic spray tanks and spray cups are made of high-density density polyethylene, acetal resin, or polyacetal materials. Maximum input pressure is usually specified in pounds per square inch (psi) or bars.
Spray tanks and cups differ in terms of products features. Some devices include agitator paddles made of non-reactive materials such as glass-filled nylon. Others are designed for use with corrosive or acid-catalyzed materials. Handheld spray cups may include a handle for portability. With manual spray guns, color changes can be accomplished by using quick-change spray cups. Features for spray tanks and cups also include removable liners and pressure gauges.