A portable spray booth for coating an item such as a wheel with a sprayable material. An actuator is configured in use to support a spray gun which is in fluid communication with a first supply of the sprayable material. At least one laser is operative to illuminate a wheel with laser radiation. A detector detects reflected laser radiation from the wheel to derive a signal indicative of the profile of the wheel. A processor processes the signal to obtain a control signal which is output to the actuator and the spray gun to cause the first supply of sprayable material to be dispensed from the spray gun onto the wheel in a user defined manner and a detector senses an amount of sprayable material in each reusable paint pot or canister and generates a warning signal to reorder a paint pot or canister before all the sprayable is used.