Reverse-cut letters and logos are custom made for single-use concrete casting.

Once the concrete is sufficiently hardened after casting, foam letters must be dissolved out to reveal the cast letter shapes. Use a natural citrus solvent (or benzene, which has health risks associated with exposure and contact) to remove the foam from the concrete. Other letter forms, like mdf or reverse-cast metals must be attached to the form for casting and heavily lubricated to be extractible.

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There are several kinds of letters and casting forms available. 

For the largest of projects, there are custom created forms for use in a very large concrete cast. The largest of the forms may have CAD-cut or router cut letters and logos included with a relief background as pictured in these examples.

Foam letters can also be custom cut in small sizes and large, display sizes for events and exhibitions or dramatic lobby entrances and display windows.

For casting smaller projects, you can now choose from these options:
Economy foam, 1" thick,
6" to 24" tall*. view here
Smooth foam, 1/2" and 1" thickness,
4" to 24" tall. view here
New tapered form letters in routed and shaped mdf**, 0.25", 0.5" and 0.75" thick,
3" to 24" tall. coming soon
Form letters in cut mdf**, 0.125",  0.25", 0.5" and 0.75" thick,
3" to 24" tall. coming soon
Reverse-cast metal letters (for multiple uses), around 0.75" thick
in sizes 6" to 18". view here

*Available with a paper installation template at extra cost.
**MDF is a medium-density fiberboard material.

Request a price quote for your project here.

Several articles of interest: