if the white marble tabletop already has stains, can I use this now?

I can't answer that question with impunity, but I can tell you that I have used this product on granite and marble and it has been impervious to stains of any kind for 5 years, and fluids still bead on it. It is the best stone sealer that I have found. Saying that, it is understandable that there are no stains at all on the countertop and floor that were new when I sealed them. I might scrub stained marble with CLR , rinse well, and allow it to dry a couple of days to to be rid of some soaked in stain. I have never had to deal with marble that had penetrated stains, so I can't be certain that my suggestion is a good one. Without a professional to assist in the suggestion, you might be taking a chance using something previously untried on a white highly porous stone. Personally, I would never want marble in a kitchen, because of fruit, wine/juices, grease, and dark sauce stains. Good luck,

Can I use this product to seal grout as well?

Hi JoyYesIt's a super grout sealant as wellRegardsWilliam

How long should I expect the solvent odor to linger in the room if I were to use it on the kitchen countertops (and turn on an exhaust fan or two)?

about an hour. We opened hte back door and used exhaust fans in the bathroom

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Stain-Proof Plus Premium Impregnating Sealer for Natural Stone and Concrete Countertops

Product ID: 348252140

Details

Brand
DRY-TREAT
Item dimensions L x W x H
22 x 16 x 10
Item weight
454 g
Style
Custom
Water resistance level
Water

💧3 custom sealing molecules for triple-layer stain defense

🌬️Breathable formula prevents moisture buildup

🛡️Super penetrator for deep granite & marble protection

Description

🛡️ Seal in elegance, repel stains, and own your space like a pro.

BREATHABLE MOISTURE SAFE - Allows water vapor to escape freely, preventing harmful moisture buildup and preserving your stone’s integrity.
TRIPLE LAYER STAIN DEFENSE - Maximize your countertop’s resistance with 3 custom sealing molecules that penetrate deeply for unmatched stain repellence.
EFFORTLESS MAINTENANCE UPGRADE - Transforms your countertops into easy-to-clean, stain-resistant surfaces, reducing upkeep and elevating your space’s sophistication.
VERSATILE SURFACE COMPATIBILITY - Perfectly seals basalt, bluestone, concrete, granite, marble, quartzite, and slate—ideal for both residential and commercial spaces.
DEEP GRANITE MARBLE PENETRATION - Our super penetrator formula dives deep into dense natural stone, ensuring long-lasting protection where it matters most.

Dry-Treat Stain-Proof Plus is a premium impregnating sealer designed for natural stone and concrete countertops. Featuring a super penetrator and 3 custom sealing molecules, it delivers deep, triple-layer stain protection while maintaining breathability to prevent moisture damage. Compatible with a wide range of stones including granite, marble, and quartzite, it’s ideal for both indoor and outdoor use, offering long-lasting, easy-to-maintain surfaces favored by professionals and homeowners alike.

Specifications

ASIN	B007ZDGUAY
Best Sellers Rank	#81,705 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #476 in Hardware Sealers
Brand Name	DRY-TREAT
Color	clear
Compatible Material	Granite, Marble, Natural stone, Concrete, Basalt, Bluestone, Quartzite, Slate
Customer Reviews	4.5 4.5 out of 5 stars (371)
Global Trade Identification Number	00884949000600
Item Dimensions	22 x 16 x 10 centimeters
Item Form	Liquid
Item Weight	454 g
Manufacturer	DRYTREAT
Model	110712
Number of Items	1
Number of Packs	1
Part Number	110712
Style Name	Custom
Surface Recommendation	Countertop
UPC	884949000600
Unit Count	16.0 Fluid Ounces
Water Resistance Level	Water Resistant

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