What is the name of the ratio of the amount of coating that adheres to the vehicle surface compared to the amount mixed?

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Transfer efficiency measures how much coating actually becomes part of the finished film on the vehicle compared to what was mixed. It’s the ratio of the amount that adheres to the surface to the total amount prepared, usually shown as a percentage. A higher transfer efficiency means less overspray and waste, lower material costs, and a better environmental footprint because more of the coating contributes to the final finish. Factors like spray gun settings, distance, atomization, viscosity, reducer, temperature, and technique all influence it. For example, if you mix 100 mL and only 60 mL ends up on the surface, the transfer efficiency is 60%. This differs from coverage rate (surface area coated per amount used) and from adhesion strength (how well the coating bonds to the substrate).