A.Jay Meunier, contracting specialist at S.T. Griswold and Co. in Williston, Vt., responds: Fibermesh is typically not used in conjunction with wire mesh. The function of either fibermesh or wire mesh is to reduce the physical size (width and length) of the cracks that appear in a slab as it cures and shrinks. For a 2-inch thick colored topping slab, it would be best to use a micro-fiber, which is smaller in diameter than the standard fiber and more easily worked. Even with fibermesh, the topping slab will still require control joints to reduce the risks of random cracking.
I do not know of a sealer that can be mixed into the concrete to preserve the color or finish. If the concrete is colored by adding pigment to the concrete mix, or if pigment is broadcast onto the fresh concrete (the "dry shake" method), then a wax-based curing compound containing compatible pigment should be applied. This type of pigmented...
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