(this is for plastic prop's(master airscrew, APC, ect) First clean prop and balance. removing all the factory paint including the brand name, I use paint thinner. once this is done use monokote trim sheet and cover the FRONT of the blades only.(the prop wont tach from the front anymore you will have to get a tach reading from the rear, safer anyway) streach the covering around the curve of the blades and pull it down near the hub.(Chances are, you are going to use a spinner of some sort)cut the extra off, using a #11 blade. Careful not to cut into the blades. once this is done, sand the edges of with 420 or better grit sandpaper,so as the edges are not flop'n in the wind. Install as normal and go to the field...wait till the guys see your new prop... this will take some serious punishment as well...if you trimmed it right and no trim is sticking out...this will last as long as your prop...it has been tested and it works well....give it a shot,, you wont be dissapointed..want to see mine...check out the purple haze photo,in photos under airplanes