If you are planning to fix any cracks or holes with quick dry concrete, you must allow the fixed spots to dry completely before going further to the next step.
Staining Concrete is it a trial-and error method?
Finding the right cleaning product often involves a trial-and error method. One can't always tell merely by the appearance of concrete alone. What you may assume is a grease stain may be something else.
Next, be sure to read the label carefully as to find out what substances the product can remove. A solution formulated to strip acid stain may be ineffective at removing stubborn grease or oil. The label can also provide valuable information you will need to know to perform the job to its best.
While staining your concrete floors, one is advised to be extremely cautious when using petroleum-based strippers, which tends to be highly volatile organic compounds (VOCs) and can be flammable.
Precautions When Using Chemical Strippers
Some chemical strippers can be extremely hazardous to apply, particularly if you're working in a close environment. Read the safety instructions to check for potential hazards and health effects. Products containing petroleum can be dangerous to use around the floor scrubbing machines, because electrical sparks could ignite a fire or explosion. If the chemical stripper you are using is not environmentally protected, you must dispose of immediately.
Staining cleaning Techniques
The methods you use to clean the floor are equally as important as the products you choose. For general-purpose cleaning and degreasing, one can sweep the floor and then scrub it thoroughly. For scrubbing, or even for aggressive scrubbing, one must remove glue, mastic, or paint from the floor.
After using degreasers, chemical strippers, or other cleaning compounds, it's necessary to clean the floor again to remove all residues. After the final rinsing, you can safely use the industrial wet vacuum to remove all water and debris.
When All Else Fails
You may encounter deposits that refuse to surrender to your best cleaning efforts. If scraping or chemical stripping are ineffective at removing glues, mastics, or other heavy contaminants, you may need to resort to mechanical removal methods, such as grinding. While grinding your concrete, should not be overly aggressive as it can leave swirl marks in slab and will cause the stain to react differently.
Be sure to clean the concrete as thoroughly as possible before beginning. If you take the time to seal your floor other stains will be easier to remove in the future. Those who are interested in this should look at 'How to Stain Concrete Floors' for advice and step by step instructions.