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YouTube is all MFC forms, isn't it?
I had a look at making some concrete planters at one point.
MFC forms, silicone in the corners, and some sort of coating to enable release (but I don't recall what is was).Then slap a thin harling-like coat on first, and let it dry, to ensure a smooth outer to the thing.
I was going to mix the concrete with some sort of fibre (again, can't remember what, specifically) to reinforce it.
After that, it's all about removing air bubbles. Either grab your favourite dildo, or jury rig a palm sander to vibrate the form.
In the end I thought it was too much like hard work.
NotThamesWater
Has anyone here actually made anything out of concrete?
Youtubers make it look easy. But I assume it's incredibly time-consuming and easy to fuck up.