The short answer is yes, as long as your engineered floors have more than 2 millimeters on the surface.
Yes, you can change the color of your floors and the only way is to refinish (sand) them.
Yes
Wood floors are lifetime and they can be sanded up to 9 times. Hardwood floors are really an investment in your house.
While in Texas oil base is more commonly used, water base is as durable as an oil base.
No, hardwood can not be installed directly over slab concrete. Tar and screeds have to be used. Or you can install engineered flooring which is made to be glued down over concrete.
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