Yes, you can do a second coat of ArtResin. You may choose to do this to repair the first coat, for example if there is a bubble, hair, dust or other small imperfection in your cured resin. To apply a second layer, you will prepare and apply the resin exactly the same way as the first; however you must sand out the imperfection first, and then give the entire piece an overall sanding to provide some tooth so the second layer can adhere properly. Sanding will cause the first layer to look scuffed but don't worry; when you pour the second coat on, the scuff marks will become invisible.
You can also pour multiple layers of ArtResin if, for instance, you need to cover areas of high relief, if you're pouring into a mold or if you simply like the look of a thicker coat. It's important to remember that the ideal pour is 1/8" - if you pour any thicker, the bubbles will not be able to escape. You can layer ArtResin in multiple coats, as high as you'd like, as long as you pour in 1/8" increments.
You have two choices when pouring multiple layers: the first is to pour your first layer, torch out the bubbles, cover and wait 3-5 hours until your resin reaches a jelly like stage. At this point, you can pour on your next 1/8" layer, torch out bubbles, cover, wait 3-5 hrs and repeat until you reach the height you desire. This method is especially handy when pouring into a mold or a dam. The second option is to allow your first layer to fully dry, then give the overall piece a light sanding and pour on your next 1/8" layer. Torch out bubbles, cover and let this layer dry. Repeat these steps as many times as you'd like.
Keep in mind that our recommendation of a 72hr cure time is based on a 1/8" layer. The thicker your layers are, the longer the cure time will be. It could take up to 10 days for a full cure, depending on how many layers you've poured.