A garage floor coating can only bond as well as the concrete beneath it. Dust, oil, weak concrete, cracks, or trapped moisture can interfere with adhesion and lead to peeling or uneven results. Careful preparation helps the coating grip the surface and gives you a clearer picture of any issues that need attention first. Whether you are preparing the floor yourself or hiring a contractor, use this checklist to understand the essential steps before coating begins.
Clear and clean the floor
Remove vehicles, storage, mats, and anything else covering the concrete. Sweep thoroughly, including along walls and in corners, then vacuum fine dust. Scrub oil, grease, and other stains with a suitable concrete degreaser, following its label. Rinse away cleaner residue and allow the floor to dry fully. A coating applied over dirt or cleaning product residue may not bond properly.
Cleaning alone may not remove old paint, sealers, or a slick surface layer. These can prevent a new coating from gripping the concrete. A contractor may use mechanical grinding or another surface-preparation method suited to the floor. Avoid relying on a quick rinse or acid wash as a substitute for proper preparation; the right method depends on the concrete and the coating system.
Inspect and repair damage
With the floor clear, look for cracks, chips, pits, flaking areas, and places where the concrete sounds or feels loose. Mark the damaged spots so they are easy to find during repair. Remove loose material rather than coating over it, since a finish cannot make weak concrete sound.
Repair materials and methods depend on the size and movement of a crack, the depth of a pit, and the coating being used. Clean out repairs as directed and let them cure for the time specified by the product manufacturer. If cracks keep widening, the floor has significant movement, or damage is widespread, ask a qualified contractor to assess it before coating.
Check for moisture
Moisture can move through concrete even when the surface looks dry. Signs such as damp patches, white mineral deposits, or recurring peeling from an earlier coating deserve attention. A simple plastic-sheet check can offer an initial clue: tape a clear sheet firmly to the floor, leave it in place for a period recommended by your coating supplier, then look for condensation or darkened concrete underneath.
A plastic-sheet check is not a substitute for a moisture test specified for the coating system. Test results and acceptable limits vary by product, so follow the manufacturer’s requirements or ask your contractor to arrange the appropriate test. If moisture is above the system’s limit, resolve the source or choose a compatible moisture-management approach before applying the coating.
Prepare for application
Before coating, the concrete should be clean, free of loose material, properly profiled, and dry enough for the chosen product. Pay attention to edges, thresholds, and areas around drains, where dust or residue can remain. Protect nearby walls and stored items, and make sure the garage can stay clear for the full application and curing period.
Temperature and humidity can affect how a coating applies and cures. Check the product instructions for acceptable conditions, drying times, and when vehicles or heavy items can return. Professional preparation may include grinding, repairs, and moisture testing; confirm what is included and how the floor will be checked before work begins. Brisbane Floor Coating can discuss preparation requirements for your garage and selected coating.
Cleaning, sound repairs, and moisture checks are not optional extras—they help prevent adhesion problems and protect the finished surface. Preparation also reveals whether the concrete needs specialist attention before work starts. Follow the coating manufacturer’s instructions at each step, and consider asking a flooring professional to assess the slab if you find persistent dampness or widespread damage.