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A concrete overlay on an existing slab can range from 1/4 of an inch to 2 inches thick, though a minimum of 2 inches is often recommended to ensure stability and quality. The ideal thickness depends on the condition of the existing concrete and the depth of any planned designs or imprints. Before applying the overlay, it's important to repair and clean the surface, then apply a primer. For specialized work like a stamped concrete overlay, hiring an experienced contractor is recommended to determine the correct thickness and ensure the new layer isn't too high or heavy. For context, most standard concrete slabs are between 4 and 6 inches thick.

Whether it's better to stain or paint concrete depends on your budget, desired aesthetic, and DIY skill level. Generally, staining is a more durable option because the stain soaks into the concrete's surface and won't wear away like a topical paint coating. Painting concrete can trap moisture underneath the paint layer, which may cause the concrete to deteriorate over time. However, concrete paint offers a wider variety of colors, is typically easier and less expensive to apply, and is effective at covering up existing stains or blemishes on the surface.

Yes—as long as the area has been properly prepped. Different self-leveling brands and compounds have their own specific instructions for preparation; some may require that you add primer or grind the surface. Without proper preparation of the surface, the compound will not be able to fully bond to the concrete and fill the cure as a separate layer, which makes it prone to chipping.

In most cases, you are good to stamp the concrete one or two hours after you pour it, but perform the thumb test mentioned above. You want the concrete to be dry enough so the stamps don’t sink, but wet enough that the stamps make a successful imprint. In general, this is a tricky question, as it also depends on the weather outside, the time of day, and the size of the poured concrete slab.