Back to the original question: Windy Urtnowski said that Brodak clear is somewhere between tautening and nontautening dope. I discovered when I used it on silk that it leans toward the nontautening. I had to resort to Sig to get the wrinkles out of the silk-covered airplane. Brodak brushes nicely, and I used it successfully on a silkspan-covered stunter without any supplemental tautening dope. You can use Brodak and Randolph interchangeably. On the last two planes I built, I used Polyspan with Randolph tautening and nontautening dope used as you used the two Sig dopes. I think most folks use that combination now, although some start with nitrate. After the clear is on, folks diverge to different combinations of dope and car paint. The best writeup I've seen on how to get a good finish (20 points at the Nats) was Phil Granderson's in Model Aviation about 2006. He starts with dope, then uses car paint toners in dope, and then Isocyanate Death Paint clearcoat.