Cloudy Spots On Granite

by Teresa
(WA)

QUESTION:

Hi - I have brown/black/tan/silver fleck granite counter tops in my kitchen. I have had white cloudy marks in spots that I have tried to polish with many coats, but they remain. Is my only option to have it re-buffed? Thank you!

ANSWER:

Hmmmmm.... "white cloudy marks" are usually a sign of etching, which is caused by contact with acidic substances on calcite-based stones like marble, travertine and limestone, but not granite. Granite is not sensitive to acids and does not etch.

Although there are stones (sometimes sold as granite) that do contain calcium carbonate and will etch. Not too likely you have one.

Also, you can get etch marks on black granite countertops when doctored, but doesn't sound like you have a black granite. Also, some sealers and/or topical coatings can etch/react to acids.

"Tried to polish with many coats"... coats of what? This may be what is etching.

Nonetheless, to solve this you'll need to remove whatever is on the surface. Use methylene chloride (solvent found at hardware store) to strip any coating/sealer off the surface. This should also remove the etch marks.

Strip only a small area first and then test the stone to see if the stone itself is or is not sensitive to acids.

My guess is that you'll find it is not sensitive, thus you'll need to strip the rest of the granite countertop.

Once completely stripped, test several places to determine if you need to apply a granite sealer. If so, use Stone Care Pro or SenGuard Sealers which will not etch.

If you'd like complete instructions about stripping the granite and sealing, then check out the All About Sealing Manual.

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