The trick to long boarding by “hand” is to use the body. It’s like throwing a ball. The arm mostly holds the ball and the body does all the whipping of the arm.
Same same with the long board. I call it the hula. Enough sway in the hips and the arms just hold on and apply a little pressure.
Just in case.
This curing drives me nuts, sometimes. The orange boat is not a spot where things are being glassed in small areas, and I have to wait to feather the layers as I go. It’s tedious, but really the best way.
It is the sole reason I always have some easily stopped/started side project. For the waiting...