Not easily, but eventually it will. It depends on how high traffic the sidewalk is, and how much direct sun it receives. It breaks down under uv light and would need to be reapplied. The company says after about a year. If there's a lot of traffic, it'll probably get dirty and become visible before it wears off. The two stencils I made outside my studio have lasted a few years. But, they're also under an awning and don't get a lot of direct sun, and it's not a super high traffic area. They're not as hydrophobic as they used to be, but they're still visible when they get wet.
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