Create a concrete slot drain sink mold using Stretch Form Fabric

I'm considering getting a stone or cement pedestal sink that has a slot I've looked up slot drains, which seem to be just a piece of

Slot sinks have a linear drain catch that can simply be attached to the bottom of the sink with silicon sealant making it possible to maintain,

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slot presentatie Custom Concrete vanity top with slot drain tied in with beautiful concrete industrial modern floor