Sig dope is very thick out of the can.  I usually thin 50/50 with nitrate thinner; it goes on easier with no dragging of the brush and soaks in better.  I never use it straight from the can.  You can re-coat after as soon as dry to the touch. I use thinned Stix-it on the frame after doping when using Koverall.  Show us some pics of your plane.