I managed to purchase a bottle of 106FA and try it out side by side on some hard Audi paint. Visually, both the 106FF and FA appear identical except the FF seemed a bit more viscous. Using both polishes on the metabo with a white LC CCS pad, the FA provided a longer working time than FF and the dusting was reduced. The working time was very close to PO85RD and ultimately resulted in a finish that didn't seemed to be improved upon by a subsequent polishing by 85RD. Initial cut with FA might have been slightly less than FF, but the finish ended up being slightly better, probably due to the longer working time.
In conclusion, FF and FA are quite similar, except FA seems to contain more lubricants which allow the polish to be worked longer for a more complete breakdown of the polish.
Dave
In conclusion, FF and FA are quite similar, except FA seems to contain more lubricants which allow the polish to be worked longer for a more complete breakdown of the polish.
Dave