Plastic 10 or 16-ounce TRIPLE split cup with pouring spout for acrylic pour painting. The 4 slots in this cup make it great for acrylic pouring including kiss pours, ribbons, tree ring pours, and a variety of other fluid art techniques.
These cups are 3D-printed plastic and are intended for acrylic pouring.
To maintain your cup(s) and bottle bottoms it is best to either hand wash them immediately after use (though depending on the type of paint and medium used, you may be able to peel paint out) or simply drain them and let the paint dry, then reuse it. DO NOT WASH THEM IN THE DISHWASHER.
These are not specifically for resin as they are difficult to clean, but you can use them with resin and either let them drain and dry, or clean with alcohol, baby wipes, or something similar.