As part of my kit, I ordered the wood airfoils for the vertical and horizontal stabilizers. I scuffed and cleaned the surface first, then epoxied the forms using T-88 epoxy. After that, I sanded then coated them with Polybrush epoxy varnish.
This mod will give substantially more authority to the control surfaces while also reducing drag. Because of the reduced drag, I can reduce the negative incidence of the horizontal stabilizers from -4 to -3 degrees. This will further reduce the drag induced by the negative incidence.
This is a win win modification!