It is what i do for my model 4..i put two coat of poly-brush everywere on the wing (leading edge,trailling edge,ribs,tank and false ribs)after like they said in appendice C.i glue the top first and after the bottom but not on the ribs,i am not sure but i think i heat at 250 and made all the ribs stiching to old the fabric under before to heat at 300 and 350 (i made reinforcement in trailling edge)
I follow both polyfiber and Kitfox instructions
But i think it good to follow appendice C and the part for wood bonding on polyfiber manual..i dont use polytak on the wing...i think the new model use now polytak but im not sure..