Stone Master Molds Rubber Molds for Concrete, Window Sill Mold, Creates Three 24″L Water Tables / Window Sills

Stone Master Molds 24" Long Window Sill Mold

Stone Master Molds 24" window sill mold creates 3 concrete/cast stone window sills, each measuring 24" long by 2.5" deep by 2.25" thick, tapering to 2" at the front.  They also include a drip slot on the bottom to entice water away from the building.  Use this heavy duty mold for window sills, but also for borders between various building materials, such as stone and stucco or stone and brick.

To your advantage, our molds require NO release agent!  Consequently, this saves you money, time, and clean up, as well as easy, clean release of face color pigments, unlike plastic molds, urethane molds, and silicone molds.

Furthermore, you can pour hundreds of times with this professional quality mold!

Made in the USA, both materials and labor.

Manufactured Stone Basic Mixing Procedures Using A Pre-bagged Concrete Mix for your Window Sill Mold:

This is one suggestion for mixing the concrete for this mold.  Of course, 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.

In addition, 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 window sill molds for approximately 24 hours at the minimum of 70 degrees Fahrenheit before demolding. Higher humidity is desired. Furthermore, 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.