For surface repairs and preparation, DIY kits include a mild acid wash, which is not strong enough to prepare hard surfaces and does not remove oil stains or cure the concrete. Generally, acid washing needs multiple clear water rinses, which allows moisture to become trapped in the concrete pores for days. If prep isn’t done correctly, it could cause the epoxy to peel off over time.
An experienced professional installer carefully evaluates the garage floor surface. Grinding the surface is the most recommended way to prepare the concrete floor as it removes surface dirt, oil stains, and the smooth top surface of the concrete. That exposes the pores, which allows the new epoxy coating to seep into the concrete, resulting in a strong bond. A professional can also repair any surface cracks.