Da Shorts,
I just submitted a build article to our club newsletter last week that had a couple photos and some comments. Let me try to post them here.
People say don't use it on wingtips. To pre-cover these with silkspan. But I think that advice could be more specific. It works fine for some wingtips. In my example, I used it to cover a carved tip the same way I would have covered with tissue or silkspan--except for getting it wet and trying to stretch it. Since polyspan is a synthetic fiber material, getting it wet is not going to make it relax or shrink.
If you were going to use it on a Flight Streak-like tip, I would just make sure the gussets were wide enough, and strategically located that you could slit and attach the polyspan at each of these, as needed.
I don't know about using CyA. I found nitrate dope to be sticky and thick enough to hold over reasonable curves. Not sure if CyA might give you hard spots that would telegraph thru any finish?
Da Divot
(2394) People will say that polyspan doesn't go around curves real well and that you are better off pre-covering wingtips and other compound curves with tissue or silkspan. On this plane, since I was experimenting, I decided to go polyspan all the way. Here is the covering job you are faced with.
(2398) I used the same techniques I would have used on tissue, slitting and butting the covering as needed. The inboard tip is a bit more difficult as you must work around the leadout wires. It came out fine and wasn't really any more difficult than tissue. Just don't try to sand it until you have plenty of dope on it.