There are 3 primary products you can use to concrete your garage floor -- epoxy, polyaspartic and polyurea. So which is best? Most of these materials have pros and cons in ease of application, adhesion, quality, appearance, durability and cost.
A moisture vapor barrier (MVB) epoxy has the highest hydrostatic pressure specs at 25 psi if applied to a shot blasted floor and no flake is broadcasted into it. Solvent-based standard Epoxy, polysapartic and polyurea all have a 5-7 psi rating. If you flake into them, it drops significantly. We liked MVB epoxy and polyaspartic. Polyaspartic can be reduced in viscosity to allow it to penetrate the concrete pores. Polyaspartic dries to the touch (on top) in 2-3 hours, but is still pliable underneath. Epoxy, including MVB, often takes 12 hours to dry.
The cheapest solution is a DIY epoxy paint from the hardware or big box store. Their instructions just tell you to chemically etch the floor, let it dry and paint it on; just one coat. Rustoleum EpoxyShield is the best known DIY solution. It's water-based and only 55% solids. They dilute the epoxy to help with adhesion, but then you don't get anywhere near the thickness of other solutions. Most of these DIY solutions last a month to a year or even two depending on the prep. We do not encourage this solution at all. Because the epoxy is exposed, it will yellow over time and peel up in the tire area.
Grinding is a superior prep method compared to chemical etching and critical to remove previous coatings or sealers. A 3rd method of prep would be a shot blaster, which is even better. Shot blasters will profile the concrete for the best adherence, but do not flatten the floor or identify any dips. Our goal is to achieve a CSP3 concrete surface profile and a true dust-free environment prior to coating. That can only be achieved by shot blasting. In most all cases, we grind first and then shot blast.
Our advice -- keep your options open and compare. We'll help you decide which is best for you in terms of quality, durability and cost.
Contact us for a quote.