A single shot of accelerator sprayed above the pen about a foot over the spinning pen so the mist falls on to it. Don't shoot directly at it. If you are using a dust collector to draw off fumes, then the accelerator is sprayed so that the mist will be drawn over the pen on the way to the collector. Too much or too close and the CA can frost over and you will need to sand it off and restart.
That's what I do. The next turner may have a slightly or totally different way to do it and have success. You need to play with variations until you find the way that works for you.
Pete