http://www.properautocare.com/remswiruscir1.html
I always thought FP didn't have fillers.
Swirls can be visually hid by polishing the surface with a non-abrasive polish such as Menzerna Final Polish, Meguiar's No. 9 Swirl Remover or 3M Perfect-It Swirl Remover. This rounds off the top edge of the swirl, robbing sunlight of a sharp edge to cause a reflection. When you buff off the polishing residues, fillers will stay in the depressions. Finish by applying your favorite wax or paint sealant. This will hold the fillers in place, cosmetically hiding swirls and minor paint blemishes. This procedure does not remove the swirl. Swirls may be visible in certain light conditions (fluorescent lamps are ruthlessly revealing) and will reappear as the wax ages. That said, most people will look at your car and think it's flawless.
I always thought FP didn't have fillers.