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Valentino Dolomite Honed Marble Sealing

last year

I am installing Valentino Dolomite Honed Marble countertops and the fabricator is recommending I use a professional company to seal the marble. The 2 slabs cost about $4K and the installation another $4K. Sealing quote is $3800!!! That seems ridiculous to me. I found another company that quoted $1K. That's much better but still very high. I'm handy enough to seal the counters myself but don't know what product to use. I would like to get a piece of the counter and try different products on a remnant and then test them with various things - lemon juice, wine, vinegar, etc. What products should I try? Thank you!

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