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I've been working with different silicones for mold making and I would really advise to use a release agent between the object and the silicone when you make a mold. The easiest way is using wax (e.g. car wax or spray wax). Just apply or spray some on the object, let it dry and polish a bit before submerging it in silicone. Wax is also great if you're making two-part silicone molds - just apply some wax on the first silicone part so that the new silicone part wouldn't stick to the first one. Also, if you're making two-part molds, add some 'keys' - make about 1/2" wide pits/holes in the first silicone mold part (remember to wax!), so when you mold the second part, the two intersect - this will help you to keep the two parts together and in the right possition when pouring plastic.
If you need to remove silicone from a surface, the easiest way is to use white vinegar. I used it to remove special mold-making silicone, should work for this cheaper version as well. I haven't tried it on ceramics, so do a test clean on a sample just in case.
If you want to make two (or more) part mold, follow the instruction above. THEN cut out a few small holes/pits on a surface that will intersect the second part - these will be the 'keys' that will help you to put the mold parts together the same way every time. Add release agent (e.g. vaseline/car wax/spay wax) on the object and most importantly - on the first molded silicone part. Without the release agent, the two silicone parts will stick to each other - no good for you. Apply a second silicone mold part (as you did with the first one) and let it set. Pull the two mold parts appart, take out the object and cut out a funnel in the mold to pour the resin through. Put the two molds together, tape them for security and pour the plastic throught the funnel! P.S. you can also mold the funnel from silicone-friendly plasticine, salt dough or similar. Make sure you place the funnel in the least visible spot of your object.
If you need to remove silicone from a surface, the easiest way is to use white vinegar. I used it to remode mold-making silicone, should work for this cheaper version as well. I haven't tried it on ceramics, so do a sample clean on a small spot just in case.
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