My experience with Windex or soapy water is in placing adhesive backed decals or trim sheet. The decal or trim sheet slides on the soapy water with you position it. Then you squeegee the water/windex out from under it and the adhesive does its thing. At least one of the iron on coverings has a opaque paper backing that you can draw the design on with a sharpie marker. You want to have the least amount of overlap of your coverings to avoid bubbles. The coverings can be ironed over each other but the Monocote solvent really is pretty handy stuff. There used to be a book available on how to do elaborate Monocote designs. It dates back to the days of RCM so I dont know if it is print anymore or not. Scallops can be laid out using a straight edges and drafting templates. Lay out a straight line and then use the cross hairs on the drafting template to line up half circles of the desired size,