An interesting note. When I got on all the primer, I noticed that I had developed a bit of twist in the rudder. Looking at the plane from the nose back, it seemed that I had picked up a newly airfoiled surface. Hey, at least it was going the right way. After cogitating a bit, I decided to try just putting some high shrink dope on one surface to pull it back into shape. Well, that didn't do anything. So next step was a bit more drastic. If this didn't work, I could be faced with cutting the rudder off and doing another. Sigh...
So, I jigged the rudder up so that it was pulled back to the original position. This cause several wrinkles to form in the silkspan (the rudder is an open bay affair). I then took my heat gun and started going after it just like I was shrinking iron on plastic. Amazingly, the wrinkles pulled out as the silkspan was over shrank. A lot of dope fumes came up as the dope was desiccated and ˇViola!, the thing is straight. Check the next day and it's still straight. Weirdly, I never tried this trick before, but you can, as it turns out, shrink silkspan just like iron on plastic. Wouldn't work as well on a solid surface (I tried this trick on the twisted stab on the Shoestring to little effect). But on a spidery, open framework rudder, it worked like a charm (do charms really work?)
So, it's on to sanding primer.