Would concrete countertops be good for outside use—as in an outdoor barbeque countertop? How will colored concrete countertops hold up in the sunshine?
Outside use is possible, but you need to consider and address freeze/thaw and efflorescence problems which can be tricky. In addition, there are issues of wear and tear from weather and natural elements. Most iron-oxide pigments are color-fast, including the reds, yellows, browns, and oranges (as far as black, synthetic black oxide is more colorfast than carbon black). Greens are a bit more unpredictable, and blues (except for very expensive cobalt blue) are especially unpredictable when subject to UV rays.
