 How can I create a border to pour a thick coat of resin? You can pour art resin as thick as you like so long as you have some walls that you can work with them. One easy way to create walls is to take some sturdy aluminum tape, taping up the side of your piece and then folding it back in on itself to avoid having any sticky areas showing. From there, you can pour your resin right in and you want to work in thin-ish layers about a quarter of an inch thick and once that first layer has set in about four hours you can then pour another layer and again four hours and another layer and repeat this as often as your walls will allow. From there once the piece is cured you can pull the tape right off the next day and to address the sides you can just sand it with an electrical sander or you can even run it through a saw to just chop those edges right off and make them nice and crisp. A second way to make walls is to use a bead of silicone. Silicone is great because you can make any kind of organic shape that you like. Just pump it out onto a piece of acetate because art resin won't stick to acetate or to silicone and once you have your shape defined you can pour the resin inside and leave it to cure and then when it's cured you can just pull the silicone away and pull the art resin piece right up off of the acetate. It's as easy as that!