ArtResin epoxy resin can be thinned by heating it up, thus altering its viscosity. This will cause it to cure faster. You can heat it up by placing it near a heater or in a hot water bath, so long as it's in a glass container. Plastics tend to breathe a bit which puts the resin at risk for getting water in it, causing cloudiness. Do not attempt to use solvents to thin.