Paint isn't resistant to hot tires, unlike an industrial-strength epoxy. We prepare every garage floor by removing the previous coating by diamond grinding it which allows for maximum adhesion from the concrete to the epoxy. We guarantee no hot-tire pickup or peeling for life. Everything you need to know is at granitegaragefloors.com and at our Houzz page.

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The concrete in the garage is poured differently from a home (living space = expensive moisture barrier; non-living space = cheap and without a vapour barrier). The paint is probably letting go because the moisture moving through the garage floor was never tested for nor treated (this is common with garages...no one thinks to test the concrete).

The paint probably would have worked had the slab's moisture been mitigated (way more money than most people want to spend on a floor). I agree with Rockin'. The paint needs to be removed, the concrete slab tested for moiture, the surface properly prepared (shot blasted), the moisture issues dealt with...and then a new finish added. To be clear, an epoxy coating (as mentioned by Granite Garage Floors) is often a 2-in-1 product. When the right product is used, it can act as both the moisture mitigation system AND the flooring product. You can skip a step...with the RIGHT product.

An epoxy expert can help you find what you need.