Painters generally have a standard hourly rate for their labor, adding additional costs such as painting supplies, equipment rental, and other necessary materials. For example, A painter with an hourly rate of $25 and a two-hour minimum charge would charge you about $100 for one coat of paint on a small room. A painter with an hourly rate of $40 and a one-hour minimum charge would charge you about $140 for one coat of paint on the same small room. You can see that the price difference is due to the differing hourly rates and minimum charges.