These tubes have proven to be very good for grouting the ceiling panels we manufacture. We made large batches and filled tubes. The tubes we used later were as fresh as the first tube, so they didn't dry out. The product description states that the tubes are reusable. To reuse the tubes, the back must be slid out of the tube. This was not possible after using mortar in them. However, I would buy them again for this task as they were exactly what we needed. I would consider them consumable only, not reusable.
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