Tonight I carefully broke a few more lines with the sanding block, wet scuffed the elevators with Scotchbrite and then touched up a few areas where I had cut through. Next I'll block sand those areas flat and clear-coat both elevators.
I think I'll make a couple of supports using 3/8"UNF bolts to screw into the rodend holes, which should allow me to clear-coat the elevators and rudder in the horizontal plane to minimise the potential for runs in the finish coats.