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It depends on whether you think it is worth it to make your own concrete. While you can save a lot of money making your own concrete and pouring your own concrete slab, it's an advanced DIY. Adding too much or too little water can offset the savings of skipping the professional, as the wrong mixture will not allow the concrete to cure properly for your unique project.

You can dry pour concrete over existing concrete, but it’s best to use wet pour concrete instead. Dry pour concrete is easier to apply, but in order for new concrete to adhere to old concrete, it needs the right mixture for slow, uniform curing. Additionally, dry pour concrete is less durable and less resistant to cracking and concrete sinking, so dry pouring over an existing slab may result in surface imperfections appearing prematurely.

Yes, baking soda and vinegar can remove rust from concrete. Vinegar is acidic and can remove rust stains from concrete on its own. Adding baking soda may increase abrasiveness, which could help loosen some of the stain even more when scrubbing the stain. However, a stiff-bristled brush can do the same. 

The most common cause of concrete cracks is shrinkage when the concrete hardens and cures. The stress from the shrinkage exceeds the concrete’s strength. Concrete cracking can also occur when it experiences extremely cold or hot temperatures, such as a particularly harsh winter or a firepit built into a concrete patio.