I do it a little different. First flex the control serface all the way up then turn the wing over and iron down a strip of covering right over the gap, straight accross After it is ironed down to both wing and ail' flex the control back to neurtral while running the iron down the gap. this puts the puccer down into yhe hinge line and it is just about friction free. looks neat too. I use clear Monokote to cover the gaps. It just about dissappears. Cover the entire gap to seal against air leaking thru to disrupt the airflow.