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Concrete Casting: Architectural Precast

Liquid Mold Rubbers for Architectural PrecastArchitectural precast producers and restoration specialists use Polytek® two-part, room temperature curing mold rubbers to make molds of original or aging architectural elements which are then reproduced in concrete. Rubber molds are often used to produce concrete brackets, decorative panels, medallions, cornice molding, balusters, columns and more. 

Polytek® offers pourable, brushable and sprayable mold rubber options. Popular product options are listed below:

Excluding Polygel®, all of the polyurethane mold rubbers listed below are pourable, but can be thickened with PolyFiber II or Fumed Silica to make brush-on molds. 

Select an option below for additional product details and buying information or browse all polyurethane mold rubbers or silicone mold rubbers:

 

POPULAR OPTIONS:

Product Description

Poly 74-20 Liquid Rubber

A soft polyurethane rubber popular for making molds of models with deep, irregular undercuts. This product has a mix ratio of 1A:2B and a demold time of 16 hours.

Poly 74-45 Liquid Rubber

A mid-range hardness polyurethane rubber popular for making molds of models with moderate undercuts. This product has a simple 1A:1B mix ratio and a demold time of 16 hours.

Poly 75-65 Liquid Rubber

A medium-hard polyurethane rubber popular for making molds of models with little to no undercuts. This product has a simple mix ratio of 1A:1B mix ratio and a demold time of 16 hours.

Polygel® 35 Brush-On Rubber

A self-thickening mold rubber ideal for vertical or overhead application as well as larger models. A spray version is also available.

How-To Articles & Customer Projects

Poured Blanket Mold of Architectural Element for Concrete Casting
Two times a year, we hold a Mold Making & Casting Seminar & Workshop.
Customer Project: Cast Stone Magnolia Buds for Tattnall Square Park
West Side Stone Works of Macon, Georgia took on a mold making and casting project to create cast stone magnolia buds that would serve as finials on the columns situated at the entrance of Tattnall Square Park in historic Macon.
Liquid Mold Rubbers for Architectural Precast
How to Make a Two-Part Rubber Mold of a Baluster
This visual tutorial shows the process of creating a two-part polyurethane rubber mold of a wooden baluster.