Concrete Sealant

I'll try to give the short version! I repaired a 2 ft. long crack in my 12 X 16 patio slab. I applied a sealant to the repaired area which dried much darker than the original slab, which has a white, almost glossy appearance. I scrubbed the repaired area with gas, dishwasher soap & hot water and got about half of it off. Assuming I can get all of the sealer off, should I use Thomson's Treatment as a sealer? I don't like Thomson's so I use the UV Flood brand on my wood, but perhaps Thomson's is OK on concrete. If I can't get the rest of the dark sealer removed, what would be the easiest way to get a uniform color on this slab, which is only 3 years old and I won't be replacing it soon! Thanks!
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Wasn't Thompson's designed for concrete?

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