I'm looking for a really soft end product using a gallon of Alumisol Soft Plastic. What is the ratio of Alumisol Softener that I would need? (Not going to use the whole product) Monica P. November 05, 2020 20:50 Updated Start with something like 2 cups Alumisol to 1 cup softener. Add more for softer, less for firmer. Related articles How do I minimize air bubbles when pouring Alumisol? What kind of mold release can I use? I'm using Alumilite Clear in an open box, and I've run into 2 problems: The resin climbs the sides of the box (capillary action), and the surface of the resin is not flat. Any tips on how to get a completely flat surface on the back? Comments 0 comments Article is closed for comments.