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You are correct about the paint serving a purpose... You can swap out the paint for Glycerin. You can find Glycerin at Walmart or any pharmacy. Its a clear plastic squeeze bottle.... Just a couple drops of it will cure silicone without a doubt. Just dont add to much as it will cure faster the more you add... a couple drops to 1/4 cup of silicone is what i use. Also if you want the color still you can just add a couple drops of food coloring along with your Glycerin.