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Before beginning the Epoxy floor covering, it is necessary to remove everything from the garage floor for the recovering process. This would includes everything that would be moved from it's current location for convenience of use or when moving from the house. Items like freezers, tool cases, table saws etc. For Epoxy this would most generally mean everything not bolted to the floor.
For many property owners and professionals, a 2 part Epoxy coating ranks very high if desiring the best garage floor covering. For different Epoxy coatings there are those that dry slowly while others dry relatively faster. Those brands sold as fast drying suggest that the drying does cross linking for the Epoxy polymer. As an addition to the Epoxy coating, there are chips available to add to the mix which makes the presentation or the view of the floor is quite different. Adding the chips is a part of the application process. The addition of the chips is not a required part of the Epoxy floor covering. The plain colors available work well used alone.

In beginning the process the floor must be very clean. Some very strong chemical cleaners may be necessary to do the cleaning if there are any of those very strong stain spots (like oil or paint). Such cleaners as heavy duty detergents and or lye (like Drano) can be most helpful if not necessary while cleaning. When the stains are removed, rinse the floor completely several times. So that there is no detergent residue remaining, it is important to have all the cleaning products removed.
When the rinsing is complete the cement needs to be etched. A kit containing concrete etch material can be helpful in this step if purchased. For the etching, make sure you are using a mild acid such as sulfuric or phosphoric acid. Some acid products that are available for etching like HCI, will cause cement crumbling. As recorded above, avoid specific acids listed in the directions provided.
When completed with the etching, it is advisable to do a heavy grit paper sanding of the floor to remove any 'loose' material and then vacuum the floor completely picking up any particles left. When complete, do another very through rinsing and then make sure the cement is completely dry before proceeding to the next step. Moisture remaining in the cement will cause the Epoxy to bubble a bit as it is applied. This problem will continue even after the Epoxy has dried completely. Rinsing with alcohol when the floor is completely clean will help get the cement completely dry. After the alcohol, rinse with a product that is compatible with Epoxy. Water is totally incompatible. Be aware that the chemicals being used with Epoxy are flammable. When the etching and cleaning processes are finished, make sure the concrete floor and tools and clothing are totally dry.
Brushes, rollers and other tools purchased for the Epoxy application will be thrown away when this project is complete. It is not necessary to spend high prices for these tools. After the project is complete or possibly before beginning, you should take some time to calculate the janitor services or commercial cleaning that may be necessary for maintenance when the project(s) is/are completed.Source