 How long should I wait before applying another coat? There are two methods for applying additional coats. The first is the speedier method. So after you've applied your first coat of art resin, wait about three to five hours until that art resin has reached a gel-like state. At that point, you can pour your second coat over top, and the two layers will cure simultaneously, creating a very strong bond. The second method takes a little bit more time, but is nonetheless equally strong at the end. You will pour your first coat of art resin, and wait 24 hours until the art resin has completely cured. At that point, it's no longer sticky, and you're going to need to take a piece of 80 grit sandpaper to rough up the surface to provide some tooth for that second coat. At that point, you can pour your second coat over top, and again, those layers are going to bond very, very strongly together. You can repeat either of these methods as often as you like until you reach the thickness you desire.