Stone Master Molds Rubber Molds for Concrete, XL Retaining Wall Block Mold, 16.5″Lx10″Wx5.75″D

Stone Master Molds Retaining Wall Block Concrete Mold

Create your own blocks in the color of your choice and save money with our Retaining Wall Block Concrete Mold.  This mold forms 1 retaining wall block measuring approximately 16.5" long at the front, 11.75" long at the back, 10" wide, and 5.75" deep. The mold itself is 18.25"x13.25"x7" and weighs approximately 35 lbs.

Of great importance, our rubber molds require NO release agent!  Consequently, 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. They are production quality molds and can be used hundreds of times with proper care.

Manufactured Stone Basic Mixing Procedures Using A Pre-bagged Concrete Mix for your Retaining Wall Block Molds:

This is one suggestion for mixing the concrete for the retaining wall block concrete 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 the Retaining Wall Block Concrete 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.