The best sealer for granite countertops is a matter of opinion. Beware of granite contractors or salespeople telling you to seal your granite countertops every 6 months or every year. If that’s the case, you’re probably dealing with poor quality top coat sealers!
Properly sealed with impregnating sealer, your granite and other natural stone tops will be protected for 3 to 5 years. MB-24 Impregnator/Sealer from MB Stone Care is the granite sealer I have used to protect newly installed stone countertops for over 22 years – literally thousands of countertops!
If you follow the directions, apply properly, and re-apply as needed every few years, you’ll have the best protection possible from stains (to be transparent, MB-24 is the new & improved version of MB-4 sealer).
Why does granite need to be sealed?
Let’s back up a minute. Your granite counters may not need sealer at all. Granites vary in how porous they are and how easily they can stain. For example, lighter color granites, as well as marble & limestone, are often more porous and require multiple coats of sealer. Whereas, black granites usually need none.
Use The Water Test to Determine If You Need To Seal
How can you tell if you need to seal your stone tops. Try this simple test to determine your need to seal.
How To Seal Granite
Apply granite sealer by spraying or wiping liberally over a small area, then let the product sit for approximately 10 minutes to allow maximum penetration. Make sure to keep the surface wet with sealer and don’t let it dry.
Remove excess sealer with a clean dry cloth and then buff the surface with another cloth until it shines. Allow 24 hours to cure before using the countertops or before applying another coat. Here are the step by step directions:
Granite Sealing Instructions
Make sure countertop is dry and free from soils, waxes, sealers, and coatings. Liberally apply an even coat on the surface being treated using a lambs wool applicator, paint brush, low pressure sprayer, or spray bottle. Then let the sealer soak into the stone’s surface for up to 30 minutes.
The porosity of stone surfaces will vary. But, if the sealer absorbs into the surface in under 10 minutes, multiple applications will be needed. So repeat the process until the sealer stays on the surface for more than 15 minutes. But do not let excess sealer dry on the surface.
After the sealer has remained wet on the surface for approximately 20 minutes, remove all sealer and residue from the surface with a dry cloth or towel. Maximum stain protection is after sealer has fully cured. Curing takes 24 to 36 hours. When properly applied and cared for, MB24 will protect for 3 to 5 years. Coverage: 150 sq ft to 250 sq ft per quart.
Best Sealer for Granite Tables
In addition to sealing your stone countertops, make sure you protect your natural stone top tables from staining. Here’s how to seal marble tables, granite tables, and other porous natural stone furniture.
Best Granite Sealer For Hotels, Restaurants, and Bars
MB-24 sealer is also the best sealer for stone countertops in commercial areas. It’s made for stone countertops and it’s safe for areas that come in contact with food. Spray onto counters and let the sealer sit for several minutes.
Then wipe excess and buff with a cloth. MB-24 is also a superior grout sealer for hotels & restaurants. See How To Seal Grout In Hotels & Other Commercial Areas for instructions.
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