Making a Foam Gun (playing with foam)

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I have been researching cement options for my new bamboo dome, I wanted something lightweight to cover it, and having something cheap would also help. I quickly found a lot of information on using a small amount of cement slurry mixed with a very thick soap foam could create a product called aircrete. Aircrete has been known and used as an expensive specialty product for nearly 100 years, but a recently a couple of innovators have build (and sell plans and parts) to make DIY foam guns for the small builder. Basically you need an air compressor, a reservoir and

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