the way I have always done it is. Draw out your flames, then follow your flame lines with 1/4" masking tape using the inside edge for the outside edge of the flames. After this is done cover the entire area the flames are with paper> I have used plain old newspaper taped together to do this. Then take a grease pencil or crayon and rub the newspaper so the tape layout underneath shows thru. I then take an exacto knife and cut out the flame design, cutting down the center of the 1/4" tape underneath. When this is done I go back and tape the paper down on the exposed edge of the 1/4" tape with either3/8 or 1/2" tape this should leave your flame design ready to spray. I know this sounds a little complicated, but I have done many flame jobs this way and it works,good luck