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How do I seal an existing concrete floor before patching it?

We are patching an old concrete slab and we are having a problem with the glue or concrete seeping through small cracks onto the floor below. Is there something I can seal it with before we pour?
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How to caulk vertical seams of concrete step risers?

I am recaulking some concrete steps, and the concrete/masonry caulk I bought says it's self leveling and for horizontal surfaces only. Are there caulks that are meant for concrete but will adhere ...
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Repair tub liner with water trapped beneath

The previous owners of my home installed a tub liner rather poorly. The first time we used it, water was trapped between the liner an the tub. The top portion is tile, the bottom is a tub with a ...