How to Restore the Shine on Cultured Marble Countertops

By: Danny Lipford

The cultured marble vanity top in my bathroom appears dull and lifeless. What can I do to revive and restore the shine? -Thelma

Cultured marble is made of a mixture of polyester resin, limestone dust, fillers, and pigments with a clear gel coat finish on top. While you can’t remove deep scratches that go all the way through the gel coat, it is possible to restore the surface and shine using extremely fine sandpaper and polishing compounds.

Automotive compounds are mildly abrasive materials that are used to smooth and remove blemishes from cultured marble, fiberglass, paint, or clear finishes. They’re available at auto supply stores as rubbing (red, more abrasive) and polishing (white, less abrasive) compounds.

Automotive compounds can be applied to the surface by hand with a soft, cotton cloth, or by using felt or wool pads on a power buffer, which requires much less physical effort.

If the cultured marble surface is just a bit dull, try buffing it first with polishing compound, following the instructions on the can. If polishing compound doesn’t do the trick, buff with rubbing compound, followed by polishing compound to remove any scratches left by the rubbing compound.

If the cultured marble surface still isn’t smooth and shiny, try wet sanding with 1,000-grit wet/dry sandpaper (also available at auto supply stores), followed by buffing with rubbing and polishing compounds to remove any scratches from the sandpaper.

Wipe off any residue from the compound with a clean, soft cloth, then wash and dry the top with water.

Cleaning and polishing products that are specifically designed for cultured marble, such as Gel-Gloss Marble Polish, are also available.

Good luck with your project,

Danny

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5 Comments on “How to Restore the Shine on Cultured Marble Countertops”

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  • Luke Yancey Says:
    November 29th, 2016 at 7:31 am

    Thank you for mentioning Gel-Gloss Marble Polish. I recently moved into a new home with marble countertops. Some of them are a little damaged. I will try picking up the product and trying it out this weekend!



  • roland Says:
    March 11th, 2016 at 6:03 am

    how do i get a polished look and feel if i cut a rounded corner from an existing vanity ? is their a product that i can apply and then polish to get the finished look?



  • holly Says:
    February 25th, 2016 at 2:35 pm

    my cultured marble countertops (late 1960’s) are yellow how do I bring them back to white?



  • tom martin Says:
    February 24th, 2016 at 5:17 pm

    a few of my cultured marble shower panels are showing dull areas amid the normal glossy surfaces. I bought a spray product but it doesn’t bring back the gloss in those areas.
    Is there a product I can use or a method I can use to restore those dull areas to glossy again.
    Thank you.



  • Brad Says:
    November 8th, 2014 at 8:40 pm

    Can I obtain a custom cast solid surface shower pan which is a nonstandard size and shape and reuse my existing solid surface wall panels? I had a leak at the drain area of my shower which allowed water under the old solid surface floor and on top of the pan. I have completely removed the shower down to the studs and was able to get all solid surface panels out without damaging them. They are made of a very heany stone like substance which is highly polished on one side. I had a curb system constructed out of 2×4’s. I would like to locate a cast solid surface pan which incorporates the curb which would provide a better water seal and eliminate some caulking joints. My floor is roughly 36×49 with one corner angled off. The drain is not centered as well. I really like the heavy quality of the existing material and prefer not using acrylic.


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