Summarize the following:
Frisket film is a transparent sheet with a slightly sticky backing that can be placed directly onto hard surfaces and removed without damaging existing paint jobs. Buy frisket at craft supply stores. Avoid buying glossy frisket if using water-based paints as the paint will smear on the glossy surface. Ensure that there is no dirt or grime on the material you want to airbrush. The frisket film stencil can be reused, but if the sticking surface is dirty, dirt will be picked up and the film will lose its ability to stick. To protect a large surface or a large image, simply lay down a large sheet of frisket or unroll enough frisket to cover the whole image. Use scissors to cut frisket from the roll. Peel back a corner of the paper from frisket film and set frisket sheet over the image. Slowly peel away the backing while smoothing the frisket down over the image. If laying down a large roll of frisket, use a bench scraper or roller smoother to smooth and remove air bubbles from the frisket. Set material with image on a cutting mat so material with frisket on top is on the mat . With a sharp utility knife apply a little pressure to cut the outline of image through the frisket. If you press too hard, you will cut the material that is being airbrushed. Lay frisket directly onto printed photo paper, heavyweight paper, or cardboard. Frisket is a great choice to make a detailed stencil. For simpler stencils, use paper, acetate, or cardboard instead. Use the tip of the utility knife to gently pry up a corner of the frisket. Use fingertips to slowly pull away frisket to reveal image. Load airbrush with paint and airbrush over the stenciled image.  Remember to wear a respirator when using the airbrush. Keep the pieces of frisket film that was removed from the stencil. Put them back in place while airbrushing to keep over spray from affecting the design.

Summary:
Purchase frisket film either in rolls or by the sheet. Clean the airbrush surface. Cut a piece of frisket film large enough to cover entire design. Place unpeeled frisket over image. Use a sharp utility knife to cut out image. Remove frisket from image and airbrush item.