An example is Ubatuba granite: it's very bulletproof and usually does not require any sealing. Sealer generally does not penetrate this stone and is useless, leaving a hazy film on the surface.
Granites vary in how porous they are. Actually, some granites never need sealer and should never be sealed. This goes for most black granite countertops which are typically very dense and will neither stain nor absorb sealer. Other stones may need several coats of sealer.
The truth is that most (but not all) granite countertops need to be sealed. There is a simple test to see if you need to seal the countertop you're choosing and determine when your countertop needs to be resealed (typically every 5-7 years, depending on the sealant).
Unsealed granite counters are susceptible to stains from food, drinks, and other spills. Since granite is porous, is can quickly absorb food and liquids, which is then hard to get up. Sealing your countertops is the best way to avoid stains like this.
Most granite is very stain resistant and does not “require” sealing. However, sealing is an added precaution, and many fabricators and installers do recommend it. Quality Granite & Marble typically makes this determination, and applies sealer when needed.
Unlike granite, quartz doesn't need to be sealed on a regular basis in order to prevent staining. The nonporous surface makes it an ideal choice for food preparation and maintenance. You can clean these countertops with some warm and soapy water when necessary.
Before applying a new coat of sealant, take the "water test." Take 1/4 cup of water and pour it on the countertops. If the water stays "beaded" on top, your counters should not need sealant. However, if the water appears to seep into the surface or you notice a dark spot, you should seal the granite.
Unsealed granite countertops will soak up anything that is spilled on the surface. Put a few drops of water on the granite, leave it on the countertop for a few minutes. If you come back and see that the water is gone and soaked into the granite it is time for the stone to be resealed.
The best granite sealers for permanent results are fluorocarbon alphatic resin ones, unlike common types of sealers, they don't evaporate or weaken.
It is like any other natural material. Wood has its grain, and stone has its pores. Fortunately, it's easy to seal a granite countertop. It takes just a few minutes and requires little more than a granite sealer and a clean pad.
Clorox and Lysol sprays and wipes are convenient, but they are not safe for granite countertops. They rarely contain bleach, but they do generally contain citric acid to help remove soap scum. Avoid using bleach as well.
It has a natural water resistance that helps protect it. However, it isn't water-proof. Because granite is a stone, it is also naturally porous. And while it won't absorb in the same way as, say, sandstone or limestone, it will still absorb bits of moisture that can eventually damage your counters.
Reasons to be Cautious about Granite Countertops
Granite is porous. This means that unsealed or poorly sealed counters can absorb wine, juice or oil, producing a stain that might be impossible to remove. A poorly-sealed countertop can also harbor bacteria in its pores.
Choosing the Right Sealant is Essential
For this reason, look for products in the class known as impregnating stone sealers. They are chosen by professional contractors for sealing granite, marble, and slate countertops. The top-rated product in this class is Tenax Hydrex Impregnating Stone Sealer.
Granite is Heat Resistant
Placing a hot pan on a well-maintained granite slab will not cause it to crack or weaken. Just remember that repeatedly placing a very hot pan on the same spot may cause granite to discolor.
# Absolute Black Granite
Black has always remained one of the favorite colors when it comes to the granite used in the bathroom or kitchen areas. It has been best in adding the bathroom or the kitchen with the contemporary impact of the variation taste.
Resealing granite prevents permanent damage to the stone and restores the original, factory shine. There are many sealers to choose from, but your granite countertops retailer should recommend the best product for your exact variety of stone.
Note: Some experts will recommend sealing granite countertops every “6-12 months” or “3-5 years”, but there is no hard and fast rule.
Do use a mild detergent soap. Regular Dawn or other dish soaps work well. Do use a soft cloth. No special tools needed here: a soft cloth will help remove all grime and dirt without damaging countertops.
As good as a cleaner for windows and other glass surfaces, Windex has some elements on its compositions that can permanently damage granite when used for a long time. For that reason, you should never use Windex on granite.
You should not use Lysol on your granite countertops, backsplashes or vanity tops. The cleaner contains harsh ingredients that can cause your sealer to lose its effectiveness. In specific, scents such as lemon contain citric acid, so you need to keep away from those.
Most water stains are only a temporary problem. The granite may darken or lighten in color when the water is absorbed into the stone. However, once the water evaporates, the color of the stone should return to normal. You need to seal the surface regularly with a high-quality sealant, which prevents water absorption.
Tap the Granite's Surface
You should know the sound produced by natural granite when tapped. Real granite produces a ringing sound when tapped. Gently use a spoon to tap a granite countertop. Fake granite countertops produce click sounds.
It's important to understand that an impregnating sealer should not alter the color or finish of the granite counter. It won't make a polished surface dull, or a matte counter shiny. It's invisible when dry.