It will cure externally in several minutes and cure completely in 12 hours. You now have a stable closed cell silicone foam). (The mix will begin to foam but settles down fairly rapidly. This will begin to skin over and release some acetic acid smell but this is normal).Īdd 5 milliliters vinegar and continue to move quickly. (Move quickly but mix completely to prevent voids. These steps go together easily.Īdd 10 grams baking soda. Weigh out 20 grams caulk, 2 grams silicone oil, and 3-4 drops dish detergent. Any dish washing detergent to lower surface tension. (I learned the hard way to not use V M & P naphtha, Xylene, or others as they causes too many problems). I used Super Lube from Home Depot but any will work to thin silicone. Used for lubrication of many materials and readily available at hardware stores. (Look for releases acetic acid on the back of the standard 10 ounce tube). This is the one most used for sealing bathtubs and other areas. The caulk has to cure with moisture liberating acetic acid. Use GE type one, Dap, or other acetoxy cure silicone. And, as always, comments and dialog are welcome. But I will start with the finished product so you can decide to watch my process or not. This will be covered in the video and the best formula and procedure will follow the video. My overall goal was to produce a good, stable, and functional foam using materials that are already in our homes and readily available locally. Little did I realize how many roads of partial success and failure I was about to travel! What followed was a number of experiments in thinning silicone caulk, and generating CO2 as the foam producer. I wanted to do it totally using simple chemistry and not get involved with CO2, O2, and nitrogen generation as foam producers. But, I still did not want to buy the foam and decided to make it myself. I have a preference for silicone foams as they have more physical qualities that allow some real latitude in use. Periodically I have a need for a good closed cell foam but not often enough to stock varying densities of different types of foam for occasional use.
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