Stone Master Molds Rubber Molds for Concrete, Shutter Block and Trim Stone Mold, Creates 6 Stones, 13″Lx2.5″Wx2.25″D Each

Stone Master Molds Rubber Molds for Concrete, Shutter Block Mold

Stone Master Molds’ Shutter Block Mold delivers six perfectly formed concrete trim stones—each 13″ x 2.5″ x 2.5″. Designed to create a smooth, flat mounting surface, these shutter blocks install on both sides of a window, typically three per side. Versatile and durable, they’re also ideal for accenting windows, doorways, fireplace surrounds, and more. The mold itself measures 21.5″ x 15″ x 2.75″. Save money by pouring your own concrete shutter blocks and trim stones—and as always, no release agent needed!

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

This is one suggestion for mixing the concrete for the Trim Stones. Of course, there are many other instructions available online, including videos.

MOST IMPORTANTLY, 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.

Next, vibrate the molds to release air bubble. Cure in the shutter block 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.