Many companies make micro toppings that can resurface your concrete very easily at about 1/16" thick. I realize this is a lot of information, but it is simple if you follow the steps. For your outdoor location you should use a solvent based MMA Arcylic sealer. If you take shortcuts on this step then residue will be left behind and it can be a bond breaker for the sealer. This will probably take at least three rounds of scrub, rinse, squeegee. Scrub with a brush and rinse with water until the water is clear and nothing else is coming up. Remember to were long sleaves, double up on nitrile gloves, and wear some eye protection. It is a good idea to keep some baking soda around in case you get some acid on your skin. You can use baking soda but it leaves more residue and you will already have a bunch of sludge to clean up from the acid stain. I like to use non sudsing amonia about one part to ten parts water. You can leave the stain on for two or three hours for a really dark stain but try to keep it wet. Without testing an area first you have no idea how long it will take for the stain to finish its reaction or reach the point where you want to stop it.
Different concrete will stain at different rates. One person can do this but it is far easier with two. Have someone follow to scrub the surface with a broom in a circular motion. Keep the edge wet and wet out the surface. Apply moving your arm in circular motions. Keep the tip about 14" off the surface and perpendicular. You can use a pump up sprayer from your local hardware store to spray a fine even mist on the surface. If you will apply it: Make sure you mask everything off really well. New, or "green", concrete will stain quicker than older cured concrete. If not you can go stronger of stay with full strength to hide the original stain.
If it was diluted then hopefully they took notes on the ratio. If it was spilled out of the original container at full strength then use full strength. Also, make sure you use it at the same strength. Different products will produce different colors even if the name of the color is the same. If you do stain it all, then make sure you find out what stain was spilled on it to start with. If you haven't done anything yet you do have two simple options. Sorry I didn't catch this thread three weeks ago.
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