I was really woried about this step but so far its working ok. Sprayed the control surfaces with EcoCrilic Miami Blue. The first set was the flaps and rudder. I used a tack coat and four cross coats working up to full color. This resulted in Orange Peel . Next set was the ailerons and hor stab. This time I used a tack coat and a single wet coat. Better surface finish. I think the tack coat was to heavy. Next set I will use a lighter tack coat. --but I dont want runs.