Stone Veneer Rubber Molds for Concrete, Corner Plug

Stone Veneer Rubber Molds for Concrete, Corner Plug


  • Each Corner Plug for concrete molds fits Stone Master Molds’ Cliff Stone, EZ Stack, Fieldstone, Weathered Blend and Limestone Corner Molds; sold separately, but not required
  • Professional grade rubber mold will last for hundreds of pours
  • NO RELEASE AGENT necessary
  • Matching Corners sold separately
  • Made in the USA
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2 - 3



4 - 6



7 - 99


Stone Master Molds Corner Plug for 1-Step Corners

Stone Master Molds Corner Plug for concrete molds is useful for one-step corners, but not required. Each 22.75"L x 10.75"W x 2"D Corner Plug will fit our Cliff Stone, EZ Stack, Fieldstone, Weathered Blend and Limestone Corner Molds made by Stone Master Molds.  These professional quality plugs can be used hundreds of times.

Pour the long, horizontal end of the corner mold first, place the plug on the mold, then fill the open, short end and lightly vibrate. Top off the short end and lightly tap or vibrate to remove additional air bubbles.

These Corner Plugs are designed with a highly textured underside to create texture on the back of the concrete corner, improving bonding when installing. Our molds require NO release agent.  This will save you money, time, and clean up, as well as easy, clean release of face color pigments, unlike plastic molds, urethane molds, and silicone molds.

Made in the USA, both materials and labor.

Manufactured Stone Basic Mixing Procedures Using A Pre-bagged Concrete Mix:

This is one suggestion for mixing the concrete for our rubber molds. There are many other instructions available online, including videos.

BE SURE TO USE A CONCRETE MIX THAT CONTAINS PORTLAND CEMENT. We recommend Sakrete Maximizer, as it has lightweight aggregate, is high strength, and yields more product, but there are many kinds you can use. Follow the manufacturer’s instructions for mixing.

If using pigment, add desired iron oxide pigment to mixer (100% pure, no additives). These can easily be found on Amazon, etc.

A plasticizer can be added to reduce the amount of water in the mix. Pour into the molds which may already have coloring additives… NO RELEASE AGENT NECESSARY. Vibrate molds to release air bubble.

Finally, cure the concrete in rubber molds for approximately 24 hours at the minimum of 70 degrees Fahrenheit before demolding. Higher humidity is desired. Molds can be covered with a tarp to retain more heat and humidity. Continue to cure demolded stones at 70 degrees or greater until ready.


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