It's true, you don't need afterburn, or after run , oil with coolpower. However, you should always run the fuel out of your engine when you are finished for the day. This should be done while the engine is still hot and with the glow plug ignitor on so you can start it a couple more times to make sure you got it all.

The way I do it is to drain the tank after the last flight. If I can get to the carb I just disconnect the fuel line, attach the glow clip and flip it through several starts. If I can't get to the fuel line, I start it, move behind the plane, pick it up and point it nose down till the engine stops.

Note, if you're going to leave the plane sitting for a while before the next flying session it's a good idea to add some after run oil to protect the bearings and prevent the castor from gumming up.