Last Updated on

GRout Sealing Guide –

 Ultimate Guide How To Seal Your Grout

Learn how to seal your tile grout with this ultimate grout sealing guide – learn how to seal grout like a real tiling professional.

Sealing your tiles or grout is one of the best ways to prolong the look and performance of your tile grout by creating a barrier that repels dirt and water.

By using a simple applicator and a grout or tile sealer, you can take on this easy task yourself and safeguard your beautiful tiled finish for years to come.

This grout sealing guide is designed for the total beginner and aims to provide the easiest way to seal tiles and grout with only a couple products.

I primarily focus on grout sealing as that’s the most common form of sealing that a homeowner will undertake. Tile sealing is essentially the same thing except you have to apply sealer to the whole entire tile surface.  

Please note if sealing tiles: Only natural stone tiles and some types of unglazed porcelain tiles can be sealed. 

Grout sealing is easy with the right tools.

Why We Need To seal Tile Grout

UNDERSTANDING THE SCIENCE

Before we begin the tile and grout sealing guide, we will take a quick look at why we need to seal them and why it is an important step in tiling.

Grout in its essence is a fine, cement based compound that is enhanced with coloring agents and mold inhibitors.

Depending on the type of grout, some have added polymers to increase its strength while epoxy grout contains latex polymers and special liquid compounds that render it closer to plastic than actual cement.

We all know what cement looks like, its porous, has lots of gritty aggregates and sands and although it cures to one solid and strong mass, it still retains that porous structure.

Your grout, while not as gritty or rough, is still very porous and allows water, dirt, bacteria and mold to reside within it.

This all leads to dirty grout and maintenance nightmares as the grout is catching dirt and changing color in random patches across your tiles.

A sealer acts like a barrier in between the grout and the outside world, effectively stopping any water, dirt and other contaminants to enter it.

Once applied, the a grout sealant generally lasts anywhere from 3-5 years but an annual reapplication is recommended by manufacturers to ensure it is working properly and that there are not any areas where the protection has worn away.

High traffic areas or wet areas like showers that see a lot of water would definitely benefit from an annual application of a quality sealant.

That is why using the a quality grout sealant for shower floors is a very popular task for modern home owners as it saves time cleaning in the long run.

Sealing your grout is a great way to lessen time cleaning your tiles.

Grout sealing is not as daunting as it initially may seem and after it is done, the cleaning routine of your tiles will be much easier as the need for scrubbing and heavy elbow grease will be effectively eliminated.

Do I Need To seal My Tile Grout?

Finally, before you go out and purchase all the sealers and tools, let’s quickly see if your grout requires sealing.

You should only need to seal your grout if it is a cement based sanded grout as others like epoxy and urethane grout have bulit-in compounds and the application of a sealer would only hinder their performance.

You would probably would have been told by your tiling professional whether you should seal your grout or not.

If you purchased grout yourself and are not sure, the packaging should mention it.

Otherwise, it is best to check back with the retailer you purchased it from to see if it is sanded or not and if it requires sealing. 

You can also do a visual inspection by looking at the grout and seeing how smooth it is. If it’s fairly grainy or not 100% smooth, chances are you have sanded grout.

While the visual inspection is not the best way to be certain, it is better than nothing if you have no other way of telling what kind of grout you have.

An example of cement based grout made by Polyblend.

How To seal Tile Grout Guide

Items Required For Sealing Grout:

Grout Sealer

You can choose any brand that you prefer but I recommend Aqua-X Grout Sealer as it has added mold & mildew inhibitors and very easy to work with.

It penetrates the grout surface and seals, ensuring a deeper and more lasting seal, it’s one of the best tile sealants out there and highly recommended for most situations.

This is one of the latest grout sealers on the market and is quickly proving to be one of the best.

Not sure which sealant you require?

Check out my Best Sealers Guide.

Grout Sealer Applicator

There are many tools that you can use to apply a sealer, from paint brushes to foam rollers.

In an effort to make this guide easy for first timers, I am recommending a special sealer applicator.

You simply need to pour the product into it and use the brush tip to apply the sealer directly onto the grout.

A simple squeeze of the bottle will dispense the product neatly without splashing onto the tile surface.

This method makes clean-up much easier as you will be less likely to splatter sealer over the tiles which would require extra cleaning up after.

If you will be doing larger areas or thick grout gaps, a sealer applicator with a foam tip helps speed up the task. For natural tiles: Use a foam roller.

Nitrile Gloves

Using Nitrile gloves will help keep you safe and protected from the chemicals found in the product.

Nitrile gloves are resistant to chemicals and recommended by Aqua Mix during the use of their product.

A couple pairs should be more than adequate for the grout sealing job.

Remember to dispose of the used gloves carefully after use as the sealant will dry on their surface, making them unsuitable for reuse.

You may also want to consider some knee pads as you will be kneeling on a hard, cold surface for lengthy periods at a time.

Lint Free Cloth Or Paper Towel 

You will need one of these to help you remove any excess grout sealant that you leave on the tiles. 

Additional Tools If Sealing Old Grout

Grout Brush – To scrub dirt from grout

Cleaning Solution – Use together with your grout brush to quickly and effectively clean your grout and prepare it for sealing.

how to seal grout

Step 1 – Cleaning Your Grout

If you are sealing new grout, you can skip this step.

To write this grout sealing tutorial, I decided to seal the floor grout in one of my small bathrooms at home. This grout was a few years old and was never sealed.

I achieved a great result with these upcoming steps so if you follow along, you too should have properly sealed grout – no matter if it’s brand new or many years old and very dirty.  

Time to get scrubbin’!

It’s time to go colonial on your tiles, grab your scrubbing brushes and cleaning solution and slap on those nitrile gloves. Listen to your bones crackle and pop as you get down on your knees and begin attacking those grout lines. 

Apply your grout cleaning solution according to the instructions on the bottle and scrub one grout line at a time. Only move on after you see a noticeable improvement in the color of the grout.

I borrowed my wife’s toothbrush to get into the areas against the walls but I suggest a grout brush as the bristles are stiffer and remove dirt quicker. 

If you want to speed up the process, you can use a regular old brush with stiff bristles.

scrubbing grout with a tooth brush

Don’t Have A Grout Cleaner?

You can make a pretty effective grout cleaner with some household items!

White vinegar and baking soda work well together. Mix them into a watery paste. 

 Diluted hydrogen peroxide works wonders as well but handle with care!

Do note that this creates a bigger mess that you will need to remove with a sponge and clean water.

I preferred this method as it was quicker in the long run.

Once you have scrubbed all the grout that you will be sealing, rinse off and put away your scrubbing tools. 

scrubbing grout before sealing

Try to get a breeze blowing into the room you are working in by opening windows, setting up fans etc – this will help the grout dry quicker. Make yourself a drink, relax and wait a few hours. The hard part is done. 

Once the grout is dry, you can begin sealing! 

Step 2 – Preparing The Area

If you have new grout, make sure to give the new grout at least 48-72 hours to cure properly before applying the sealer.

This ensures the grout has finished curing and bonded properly with the tile surface. Sealing it before this time will prevent a strong cure from occurring and thus shortening the life of your grout.

While you are waiting for the grout to cure, you can mask off any surfaces you do not want the sealer to touch like baseboards or other wooden, metal finishes.

The applicator should minimalize any excess solution from spilling out but if there are any areas you are concerned about, it is best to protect them.

If you haven’t already, open up the windows in the room. This will help the grout sealer dry as well as remove any odors from the grout sealer.  

Step 3 – Sealing Grout

Now this is the part of my how to seal grout guide that you have been waiting for – actually sealing the grout! 

Once the grout has fully cured and you have masked off any sensitive areas, you can begin sealing.

Make sure the grout is free of any dirt or dust and is properly dry.

Put on your nitrile gloves and pour the product into your applicator bottle. (if you are using one.)

Some grout sealers like the Aqua-X grout sealer that I was using to seal my grout come in handy trigger bottles. 

You can apply the grout sealer directly onto the grout this way. 

If you are using the applicator bottle: using the paintbrush point of the applicator bottle, apply an even amount of solution onto your grout. 

Applying grout sealer
Distributing grout sealer

Be sure to properly cover the whole entire grout gap from tile edge to tile edge. 

I used a soft paint brush to evenly distribute the grout sealer across the grout lines. When I needed more, I simply sprayed some again and continued like this.

It is okay to saturate the grout with the chemical as it will all be absorbed anyway and will help achieve a better seal.

If you spill any solution onto your tiles, simply using an absorbent paper towel or microfibre cloth to clean it off before it dries.

Follow this procedure until all your grout has a coat of sealer applied to it.

You will see the grout has turned a darker color and looks wet, this is a good sign that you have applied enough product.

Cleaning up grout sealer that got onto tiles

Allow 30 minutes for the sealer to dry properly and then apply a second coat, following the same steps you did for the first coat.

The surface will be ready for traffic after 2 hours but keep it dry for 12 hours minimum.

A full cure will be achieved after 24 hours, making the tiled area safe for normal use once again.

That’s it!

Your grout is now properly sealed and you can enjoy an easy to maintain and healthy tiled environment that inhibits bacteria and mold growth. 

Please note: Most grouts retain their original color and shade after getting sealed but it is normal for some grouts to remain a bit darker after grout sealing. 

Further Notes + Tips For Sealing Grout

 • To check if you have applied enough sealer and have achieved a proper seal, you can drop some water over the grout.

If it beads up/puddles, then that means you have applied enough to your grout and can use the surface.

If the water gets absorbed into the grout that means you will need to apply a further coat..

• If at some point you decide to deep clean or acid wash your tiles, the grout will require a new application as it got removed during the harsh cleaning.

Bathroom that has had its grout sealed.

If you would like to read more about the best grout sealants and learn more about them, I have written a guide to selecting the best product for your needs.

Check It Out!

Best grout sealer

How To Clean Grout That Has Grout Sealer Applied?

So you sealed your grout – great! 

But now comes the question that you didn’t think to ask until you’ve sealed the grout:
“How do I clean my tiles and grout without affecting the grout sealer applied to it?” or “Will cleaning my sealed grout affect the seal?”

Both are great questions and ones that you’ll need answered before you go cleaning your tiles to avoid harming the seal on your grout. If you are going to be pro-active and regular maintain your tiles then you’ll really want to hear the answer.

Luckily, my friends at Black Diamond have told me the answer to this question and I’ll pass it onto you.

To clean sealed grout safely, you need to use a cleaner that contains no harsh chemicals or solvents in it. Preferably a pH neutral tile and grout cleaner.  

A quality pH neutral cleaner for tiles and grout is Stone & Tile Cleaner by Stonetech. This products is safe to  use on all forms of tiles including natural stone and will not damage grout sealers. 

This means that you can regularly clean and maintain your tiled surface without worrying that you are prematurely wearing out the grout sealer that has been applied.

So go on, and clean that sealed grout – you won’t damage it!