I covered a control line model I built in 1968 originally with some of the original Monokote. Plane felt very heavy, and also had a hefty tendency for the covering to go baggy. Plane weighed almost 50 ounces. I recovered with a product called Silron (blend of silk and rayon) and Aerogloss colored and clear. Ended up with a much more attractive finish that held up until the fabric started powdering about 6 years ago. Plane weight with the dope/fabric was 46 ounces, almost 4 ounces lighter, and better looking and more trouble-free. Of course, shortly after recovering, there was a recall on the Monokote, because the original manufacturer couldn't hold the tolerances in production quantities. TF had to change vendors. I still have a couple scraps of that era, and you can definitely tell the difference. I recovered the wings and tail in current Mono, and now weigh 47.5 ounces. Of course, I have also had to rebuild the nose are a couple times in the last 40 years. Not all my landings are smooth, or even parallel with the ground.

More recently, I built a Lanzo Stick for SAM RC competition. Originally covered with the current Mono, had troubles with sagging and with the adhesive losing it's grip on the underchambered wing. Recovered with layer of SG grade white silkspan with a outer layer of lightweight colored tissue and clear dope. That 9' span 1384 square inch wing lost almost 7 ounces of weight. No more sagging, no more lost airfoil shape.