The film is easy to roll here and there without fixed point. Make your painting life difficult.
Stretch film tool could fix the film. Good partner of auto paint masking film.

Advantages:
1) steel material. good quality.
2) Could be took parts. easy to carry.
3) Save labor and time.
4) Could make according to customer's request.
5) Has weel and easy to move.
6) Could be used forever.

　　Fit the tool as photos and then put the film. Could work.