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Seal Granite bock foundation for finishing basement?

Hello,
We are in the process of purchasing a home built in 1910 built in an area known for it's granite quarries. The house sits on an immaculate granite block foundation. The blocks are huge! I want to finish some of the space down there, but I don't want to have to cover up the granite walls. Is there a way to seal them to reduce dampness? The basement has never had any water problems (is dry) and is in excellent condition.
Thank you!

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