a friend send me the link and I started to read this tread because ,i'm looking at my finishing covering options and fuel proof methods ,I'll explain .. I always used sig koverall well most of the time ,and it's great ,it takes longer to get the job done, due to the fact that you have to 1st applied the glue to the surface/frame ,(sig sells stick it but stinks and it's messy to clean up ,but there's a solution to that u have to use deluxe cover grip, it's like white glue and it's heat activated once you paint the frame with it you place the fabric on top and iron it and done ,then after all that is done u have to seal the wave of the fabric using burathane dope ,,(3 coats I usually use )sanding in between ..and then after all that is done you have to paint the plane and fuel proof it now here's the problem ,I used to use nelson hobby paints ( you applied it with a foam brush),most important THEY WERE FUEL PROOF when u add crosslinker drops (cross linker is a fluid u add to the paint and nelson paints sell it with the paints )but the guy is out of business ,so now because I don't won't to try smelly paints or poison paints and spray guns etc, I'll maybe try latex and fuel proof it with varathane clear finish (never tried this approach ) ..again it's a longer process using sig fabric ,but at the end it's way cheaper than solartex,(in my personal case that I have the dope ,the thinner, fabric ,and glue ).So you have to valance that if u choose to use sig fabric.you will need burathane dope ,burathane thinner,the glue I mention and the fabric ..
Now I did try solartex and it's great!! you applied it like monokotte it's thin enough that takes the curves perfect and comes in colors ,and looks like fabric ,I never try painting it so I can't give u advice on that ,only problems 1) to expensive for a 2 m roll , 2) it's not longer goin to be made and when it's gone is gone ...
about being heavier or not well I'll put it this way the engines on those planes picture right here will lift a plane twice that side ,so for me the weight is not a concern I'm not building gliders .
I posted some pics the n11 is all solartex ,the old timer it's all sig fabric and nelson paints ..
My personal recommendation to you is that u go with solartex ,will be easier in a way to applied , will look nice ,and in a way compare to sig fabric if you don't have all the stuff u need will be cheaper ,even if its $20 a 2M roll ..
I hope my experience with these products help ..