Why would you utilize an Unfilled, or a Filled, Inside Tire Paint?

A filled inside tire paint contains specially selected fillers, like mica, to help provide the air-bleed necessary to allow any air that becomes trapped between the tire and the curing bladder to escape. An unfilled inside paint does not contain any filler and is used to obtain optimum finished tire appearance, air-bleed comes solely from the venting pattern on the curing bladder when using an unfilled inside tire paint.