The surface you are applying them on to makes a big difference as well. Have you already cleared the model? If so and you used flat clear you will never get them to stay put. I usually apply a light coat of gloss clear, rub it down with 1500 or 200 grit wet. Heat the surface of the model with a heat gun, and also heat the transfer. DO NOT use the ball end of the promark tool use the flat end. Gently rub the transfers on as you peel back the backing.