I need someone to respond to this post that has experinced the following problem while using silk and dope. About 15 years ago I used silk and dope on a Supersporter 120 everything went ok during the covering but when I applied the first coat of 50% reduced Aerogloss dope the covering relaxed and would not tighten after the dope dried. I assumed it was the Aerogloss dope. About 10 years ago I covered three models a Taurus, Sport Aire 40 and a Trainer 60 all with silk and dope except this time I used Certified Coatings Products butrate dope. I had no problem when I apllied the first coat of 50% reduced dope. The covering didn't even relax. After I applied 3 coats of clear the covering was so tight you could bounce a dime off of it. Now forward to the present. I purchased a Nobler control line model from Tower and removed the Monocote covering. I applied the K&S silk as I did on the previous three models and applied the first coat of 50% reduced dope only this time I used Randolph brand butrate dope. The covering on the stab and one elevator half relaxed and then tigntend up with no further problem. The problem is with the other evelator half and the vertical fin the covering relaxed after the first coat of 50% reduced dope and will not tigten. I applied the silk wet and pulled it tight to remove all wrinkles. I then dope the perimeter and wait until the water dries from the silk. I then take a look to verify the covering is still taught and proceed to apply the first coat of 50% reduced dope. If all goes well I apply one additional coat of 50% reduced dope and then 2 additional coats of unreduced dope prior tho spraying the color coat(s). The temperature in the basement is around 72 degrees with a humidity of less than 70%. My question is what went wrong?