I used my hands and a piece of wood to smooth out the wrinkles. I couldn't remove all the creases, but got it looking pretty good and smooth.
I made this doubler out of 0.020. I drilled 3/32 holes to attach it. And dimpled the holes. I had to use the pop rivet dimpler on the aileron skin. The reason for the cut outs in the doubler is to clear the indentations on the skin. The indentations give the skin some stiffness.
The A&P said it was important to get the nose of the doubler right down into the seam at the aft end of the aileron because the crease there could crack over time from being wrinkled.