Cut a strip of covering about 1/4" wider than the thickness of the edge of the aileron, and at least 6" longer than the aileron. Start at one end and tack it down. Work it one scallop at a time and cut the covering as needed to get it to lay down. The second strip should be big enough to cover both top and bottom as well as hinge line. Do one side, then trim the excess out of the scallops and iron down the edge you just trimmed, then wrap it around and do the other side. Trim excess as needed - use a SHARP blade! Iron all the edges well before you use a heat gun (which may not be needed at all).