RE: What do you think of FORMOST 150 ?
No mix in the elevator/flap. I did add speed brakes to the top of the flaps. They are about 3" long and 1.5" wide from the flap leading edge. When you lower the flaps, the speed brake pops up. I didn't drop them into the wing in a recess pocket. They are made from 1/16th plywood and glued on with medium CA. I removed some of the flim covering from the flaps, coated the wood with thin CA to reinforce the wood. They slow the plane down to a point where I have to add a little power. They are covered with Monokote. Be sure to check the right wing for twist. I had to add 3/16" right trim to make it fly level. I added 3/32" down on left wing and 3/32" up on right wing.....
Larry