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Yes, zip flashing tape will stick to concrete. It also adheres to metal, PVC, glass, masonry blocks, and wood. Just make sure to keep sheathing at least ½ inch away from the concrete and use a backer rod to fill the space between the two. If you don’t have zip flashing tape, try any sealant with a backer rod or professional masking tape. 

Yes, baking soda and vinegar can remove rust from concrete. Vinegar is acidic and can remove rust stains from concrete on its own. Adding baking soda may increase abrasiveness, which could help loosen some of the stain even more when scrubbing the stain. However, a stiff-bristled brush can do the same. 

With proper maintenance, exterior concrete steps can last 25 to 50 years or more. In most cases, your steps will require some minor repairs over that time frame, including sealing surface cracks and resurfacing to keep them in good condition. Interior concrete steps should last even longer, normally between 50 and 75 years, as they don’t have to stand up to the elements.

You can concrete can be done when it’s wet or dry. However, it’s safer when wet, as harmful dust and chemicals are present. Sanding it when dry is faster, but you’ll agitate more dust and chemicals, meaning you’ll need to be more careful.