I used 511 on my Carrara. The color did not change at all. I wouldn't go without a sealer either.

Hi Petunia,

I have Vermont Danby marble--very, very white with grey and a little warmer veining.

I used Porous Plus 511, and didn't notice any color change at all.

Even though Danby marble is denser and less prone to staining than the italian marbles, there's no way I'd go unsealed--Porous Plus 511 is bulletproof. While my countertops etch, they don't have a single stain...and that's after coffee stains, etc have sat without my noticing them for hours, and even overnight.

I researched the heck out of my sealer choice. 511 is a GW favorite, and I'm so glad I used it.

I used Dupont BulletProof Stone Sealer on carrera marble backsplash and it did not change the appearance at all.

You should do a test to be sure in your case. For a marble countertop, I think you'd have to use a sealant for it to be practical.

Can you still get etches out of honed Danby marble after you've sealed it? Littlechloe....what did you end up doing? Sealing or not? Thanks for the pics! And someone told me that marble can change colors over time due to air quality. Has anyone experienced this?

This is old but just adding my experience for future readers. I use 511 impregnator on a danby marble island and more recently on a Turkish marble in my bathroom. Both are honed surfaces. While the sealer does not change the color, I have noticed it diminishes the luster and sparkle of the marble. It’s an acceptable trade off to me to avoid stains.