I have a question for the gurus. I have already sheeted the wings on my Somethin Extra, and I realize that the sheeting is VERY fragile. I am afraid that I will grab ahold of the wing one day and crack the sheeting. If I had to do it over again, I would just add a small strip of balsa between the first and second rib to stiffen it up, however it is too late for that. I am really only concerned with the root bay (first bay) as that is where it will most likely be handeled.

I have 2 ideas, hear me out

One is to cover the first wing bay ONLY with very light fiberglass (leaving the outer bays like Sig intended). I have used fiberglass before to do bodywork on cars, so I have an idea of what is involved. I would be able to blend the extra thickness out over the rest of the wing with filler or resin.

Second is to drill a small hole on the root rib and squirt some Great Stuff or other expanding foam in to the wing therefore filling the void. It would end up similar to a foam core wing for ONLY the first bay.

My main concern is to get the Monokote/Ultrakote to stick. Will it stick to the fiberglass if I scuff the resin? I plan to use regualar polyester resin for easier sanding and probably better flow.

My second concern is adding too much weight. Does anyone know how heavy Great Stuff is per volume? I know the Fiberglass will add a little weight, but if I apply the resin using a squeegee, that will minimize excess resin.