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Poured concrete should be set and hard to the touch within 24 to 48 hours, although it depends on the humidity in the air, the thickness of the concrete, and the type of concrete. It’s best to leave concrete to set for three days before exposing to foot traffic or stress. Concrete takes between 20 and 30 days to cure and reach its peak strength, so for foundations and retaining walls, plan to wait about a month before placing any load on your concrete.

Penetrating sealer seeps into concrete pores to protect it from moisture and staining, cracking, and mold caused by water. This means you cannot remove penetrating sealers like topical sealers. The good news is that penetrating sealant doesn’t have to be removed before resealing, as most topical sealers must. Instead, you’ll want to buy a compatible penetrating sealant (often the same kind already in the concrete) and apply it. Always follow the manufacturer’s instructions.

Yes, you should seal your exposed aggregate concrete to keep it protected from the elements and reduce the risk of cracking and concrete spalling. You’ll need to invest in the cost of resealing your concrete about every three years to keep it in good condition. Unsealed exposed aggregate concrete is susceptible to water damage, stains, chips, cracks, and abrasion. Sealers are available in various finishes and levels of gloss. Outdoor exposed aggregate concrete should be sealed with a non-yellowing, UV-resistant sealer to preserve the look of the finish.

Whether a concrete walkway or sidewalk needs rebar depends on how it will be used. Walkways and sidewalks meant for light foot traffic don’t need rebar, and you can use wire mesh instead. But concrete surfaces that will see heavy machinery will likely need it.