How to Use Silicone Caulk Instead of Liquid Latex

If you want to produce many replicas of a decorative element for your home, the best way to do it is with a mold.
Make molds with silicone caulk.Make molds with silicone caulk.
Liquid latex is the most commonly available mold-making material, but it is thin and takes dozens of layers to build up a mold of any strength. An alternative is to use silicone caulk, which is available at any hardware store. The caulk allows a mold to be made requiring only a few layers. This technique works well if the object you are molding has a flat base, such as a bust or candle holder.

Step 1

Secure the mold to a work surface hot glue.

Step 2

Brush a thin layer of petroleum jelly to the entire object and surrounding work surface. You only need a micro-thin layer as a release agent. Be careful not to fill in any fine detail.

Step 3

Fill a bucket halfway with water.

Step 4

Hold your hand underwater and squeeze a large dollop of silicone caulk into it.

Step 5

Form the caulk into a flat disk shape under the water's surface. The water will prevent the caulk from sticking to your hands.

Step 6

Press the silicone disk into the object. It should be no thicker than a quarter-inch.

Step 7

Add more silicone disks until the object is covered.

Step 8

Allow the silicone to cure for several hours until it has hardened. Different caulks take different amounts of time; consult the label for your caulk's curing time.

Step 9

Add a second layer of silicone caulk disks, pressing them into the first layer. Allow the caulk to cure, then add a third layer.

Step 10

Remove the object from the mold once the silicone has cured. If it cannot simply pull out, cut a slit up the mold's back side with a razor blade until it can peel off of the object.

Things You Will Need

  • Object to be molded
  • Hot glue
  • Petroleum jelly
  • Paintbrush
  • Bucket
  • 100 percent silicone caulk
  • Razor blade
  • Rubber gloves

About the Author

Alex Smith began writing in 2006 and brings a combination of education and humor to various websites. He holds a Master of Arts in theater and works as a professional makeup and special-effects artist.