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Concrete cracks:
I don't understand the situation where you'd want something flexible. Is it because the crack is actually a moving joint?
For patching cracks from settling I've had fantastic luck using fiber reinforced ferous repair mortar. Its a blue grey color and costs ~$5/40lb bag. I chisel and roughen and clean the crack, soak the existing concrete with wet towels for a few days, then mix pretty and inject/trowel into crack. Because its mixed fairly stiff it sticks in vertical slots and dries into something like porcelain. Crazy hard and tough with a smooth almost glassy surface, it rings like metal when hit with a hammer. First time I used it I tried to break a little booger off the next day with a flathead screwdriver and ended up just wrecking the tip.
It is a demonstration that humanity finally understands the physics and chemistry of mortar. My friend works for a local concrete company and says new stuff tests at > 15000 psi.
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