There is one other thing I like to do, no matter the brand of covering. On your smaller items like an ELEV half for example. Take a T pin and make a small hole between each of the open areas and one more hole on the end of one of the same areas. On a small thin area the hot air can and will swell up the covering like a baloon. and makes it nearly impossible to shrink down. If this area is sheeted it makes no difference. This tip is for open bays mostly found on rudders and elevators. This also works well on ARFs. just put the holes in the hinge line where they wont be seen.

David