Plan on using about 1 part soap to 10 parts water. [3] X Research source You can also add liquid glycerin. The glycerin will react with the silicone and cause it to clump together. [4] X Research source
Construction silicone may also be labeled as silicone caulk. If your tube of silicone did not come with a syringe, you will need to purchase a caulking gun, insert the tube, cut the end off, then poke a hole in the tip. [6] X Research source
If the silicone is sticky, coat your hands and work surface with a thin layer of your liquid soap. [9] X Research source
You may also find construction silicone labeled as silicone caulk. Make sure that it is not the quick-set type. If the silicone did not come with a syringe, you will need to get a caulking gun first. Insert the tube into the gun, cut the end off, then poke a hole in the tip. [12] X Research source
If you want a more colorful mold, add a few drops of acrylic paint. This will not make the mold any more or less effective. [14] X Research source
You may have some cornstarch leftover in your dish; this is fine. The silicone will have picked up all the cornstarch it needed.
Do not mix the silicone yet.
Choose a container that is a little larger than the object you want to make a mold of.
Run your finger along the rim to create a tight seal. Make sure that there are no gaps, or the silicone will pour out.
Flat-backed items work the best for this. Wipe the items clean beforehand, if necessary.
Pour the silicone into the cup included with your kit. If your kit did not come with a cup, pour the silicone into a plastic, disposable cup. You need enough silicone to cover your items by ¼ inch (0. 64 centimeters).
