It is definitely tricky to get a smooth and thin resin layer. The resin is really thick, so it flows slowly from your wire frame, and you need to learn by experience when you have just the right amount of resin on it to cure. Too much, and you get unaesthetic bumps; too little and you will end with holes as soon as you cure it. Smaller frames are easier, so begin with those. For bigger shapes, use wires of bigger gauges and try to cure it asap (or the own weight of the resin will pull it down and pop out of the frame). However the size of the pot limits the maximum size/length of the frames you can use. The thickness of the resin also means that as it flows back into the pot, it will trap air bubbles (a lot) and you will get them on your wire the next dip. I found that you can get rid of most of them with a heat gun, and wait a while to cool down the resin. But it's a product that allow for fun projects, for someone like me that has no access to similar (air dry) products.