Ken, I still use dope on my models as well as Krylon and wally world paints, After I paint them I spray Dupli color wheel clear per the instructions on the wheel clear, there is a new covering called Doctor paper, if you ask here on stunt hanger someone can tell you where to get it, it shrinks just like the silk span of old and clear dope will adhere it as well as seal it.
Hope that this helps...