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You can use the glue that sticks to the PVC water pipe joints.
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For your own use? For production? For production, use some 3M spray glue, which has high strength, or choose some contact glue, similar to 3M1357l glue.
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SBS adhesives are fine.
It is recommended that it should be made into a frame structure with a thickness of 150mm. Concrete grade C30, 10 double-layer bidirectional, steel bar grade HRB335 or HRB400, spacing @ 120, special attention should be paid to the anchorage of the negative reinforcement of the slab. The four corners should be appropriately increased with radial structural reinforcements.
Vinegar can rot, but it's not cost-effective.
It is recommended to go to the supermarket to buy a special dredging solution. >>>More
Are you leaking water upstairs, or are you condensing water below? >>>More
Sheep's eye (that is, the kind with a circle on the bottom and a screw on the top, which is generally sold in hardware stores) is screwed on directly, and the bottom can be screwed with a fishing line or that kind of extra-thin chain, which is simple and practical.
If the cover can be removed, it can be sent to a dry cleaner to be professionally cleaned. Detergent cleans the oily part and wipes it off with a semi-dry cloth. Then dry it with a hair dryer. >>>More