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How to seal and dustproof a concrete floor

how to seal and dustproof a concrete floor

How to seal & dustproof a concrete floor

how to seal and dustproof an internal concrete floor

This article explains how to seal and dustproof a concrete floor, along with other interior walls, or work surfaces cast in concrete.

The content of the guide relates to sealing and dust-proofing interior concrete floors. There is further information regarding using impregnating sealers (also known as subsurface sealers). Whilst impregnating sealers do not dustproof, they can have some advantages when sealing wet areas.

Which product should I use to seal & dustproof concrete floors?

We recommend using Floorseal Concrete Floor Sealer to seal & dustproof interior concrete floors.

Floorseal Concrete Floor Sealer can be applied to concretes within 28 days of pouring & drying. This sealer is to be applied in 2 consecutive coats with 1 hour of drying time between coats. The sealer will accept light foot traffic within 1 hour of each coat.

Floorseal Concrete Floor Sealer is a water-based sealer, free from solvents & VOCs so easy to work with. This concrete sealer dries rapidly with little associated odour. The sealer will penetrate the pores of the concrete, partially drying on the surface and therefore is capable of fully dust proofing the concrete.

What kind of concrete can I seal Floorseal Concrete Floor Sealer with?

You can seal most kinds of concrete with our Concrete Floor Sealer including anhydrite screeds. It does not matter if the concrete is new or old or the level of porosity. If the concrete is porous, it is possible to seal it with Floorseal Concrete Floor Sealer.

The only kind of concrete we do not recommend using this sealer on is a fully polished concrete. Fully polished concretes have a mirror-like reflective finish, usually polished up to 3000 grit. This will have been carried out with either a high-speed polishing machine or a machine with a huge amount of weight.

Concretes which have been diamond ground and honed up to a matt or satin finish are suitable to seal with our concrete sealer. Polished concretes are obvious as they have a highly reflective mirror like finish, similar to polished marble or granite. If your concrete is totally matt or has a satin/low sheen finish it is suitable for sealing with Floorseal Concrete Floor Sealer. 

seal and dustproof garage concrete floors

Can I seal my garage floor with Floorseal Concrete Floor Sealer?

Yes, this product is perfect for sealing concrete garage floors. The concrete sealer will reduce the porosity of the concrete and dustproof the floor. It can be applied to new concrete and older concrete floors.

We recommend cleaning the floor with an intensive non-acidic cleaning agent before sealing older floors. This will help break down dirt, grime, and oils, so the sealer can penetrate and adhere to the surface. Please use Floorseal Stone Floor Cleaner to do this. Stone Floor Cleaner is an alkaline solution so will not attack the concrete. You will need to rinse the floor with clean water after using Stone Floor Cleaner and allow at least 24 hours of drying time after cleaning. Never seal a concrete floor with a dustproofing sealer if it is clearly damp.

Sealing power floated concrete floors

There is no real difference between sealing a power floated floor rather than an older floor. Power floated floors are likely to be found in buildings which may become a workshop, industrial units, or office spaces. Floorseal Concrete Floor Sealer can be used to seal a power floated floor in 2 coats as per normal application instructions.

You must leave the floor to cure for approximately 28 days before sealing. It is unlikely that you would need to clean a power floated floor. But it is worth removing any general dust left from the general construction process of the building and floor. If your floor has a large amount of surface tension and water/liquid will not penetrate it all you may have to etch the floor to break this tension.

How does Concrete Floor Sealer work?

It is a water-based white liquid which is applied to the surface with a roller, paint pad or brush. It could also be applied by microfibre flat mop or cloth. Once the first thin coat has been applied, the 2nd coat will adhere easily to the first. You will notice that more product is required during the 1st application than the 2nd. The sealer dries to a totally clear low sheen (almost matt) finish.

You can apply more than 2 coats if required, but make sure they are applied in even thin coats, avoiding pooling and puddling.

Floorseal Concrete Floor Sealer can also be used as a priming agent before painting the floor. We recommend using a quality floor paint to do this such as a 2-part epoxy paint. The sealer can also be used as a primer if a micro-topping is to be applied later.

If you wish to use this product as a simple primer you will probably only require 1 coat.

How do I apply Floorseal Concrete Floor Sealer?

There are full instructions on the Technical Data Sheet which you can download or read on the actual product page. But as a quick guide:-

  • Only apply to dry fully cured surfaces.
  • Test in an inconspicuous place, if not suitable do not continue to use.
  • Remove previous sealers or oils etc.
  • Apply in 2 consecutive thin coats approximately 1 hour apart.
  • Use a roller, paint pad or brush to apply.
  • Avoid pooling or puddling, thin coats are best!

The product is a water-based, low odour and rapid drying product which seals and dustproofs, it is very easy to apply.

Microfibre flat mops produce very thin, even coats with less chance of application errors or marks. Once the first coat has been applied to any type of floor the 2nd coat is much easier to apply.

What kind of finish does Concrete Floor Sealer produce?

This product will dry to a very low sheen (almost matt) finish. If the concrete is highly porous it will require more product, the finish will still be no more than a low sheen. On harder dense concretes you may see a little more of a sheen. This product will not produce a gloss finish.

We recommend testing any sealer before use, so you know are happy with the finish. The various types of concrete and levels of porosity within individual concretes all play a part in the final overall finish. It is worth checking before fully applying any sealer to a whole floor, we supply samples, so it is easy to do this!

Do I need to etch the surface of the concrete before sealing concrete?

Generally, no you do not need to etch the surface of the concrete before sealing with Floorseal Concrete Floor Sealer. Unless you have sealed the concrete before with an impregnating sealer, or if the floor is heavily ingrained with dirt or oil. Contact us first if you think you need to do this.

Etching means slightly disrupting the surface, so it becomes more porous. Most concretes are porous enough without the need for etching. Contact us first if you think you need to etch the surface.

The removal of previous sealers is important, this means stripping the sealer or breaking it down. Please contact us if you need to remove a previous sealer etc.

Coverage Rates

Concrete Floor Sealer will cover approximately 10m2 per coat. Please be aware that coverage rates always vary depending on the individual porosity of the concrete being sealed. You will not use as much product on the 2nd coat as on the 1st coat, particularly when applying with microfibre mop systems.

Sealed and protected concrete floors are a stunning modern flooring option

In conclusion

Floorseal Concrete Floor Sealer is suitable for most interior concretes where the surface is to be sealed and dustproofed and works for both floors and walls. It is low odour, rapid drying and contains no solvents or VOCs. It is probably the best and easiest way of sealing an interior concrete floor. You can use this product to seal anhydrite screeds or other porous screeds but always check before use.

Apply Concrete Floor Sealer in 2 thin coats, approximately one hour apart.

Fully Wet areas i.e. wet rooms

We do not recommend sealing a full wet area with a dustproofer i.e. a wet room. You will need to use an impregnator to seal a fully wet area. Floorseal Premium Impregnating Sealer can be used to seal wet areas but it will NOT dustproof.

Very porous concretes or screeds should not be used to create fully wet areas due to the difficulty created in sealing them. An impregnator is more appropriate for sealing fully wet areas when the concrete is of an average to low porosity.

Removing rust from concrete

To remove rust from concrete please use Rust Remover for Stone. It is a non-acidic cleaning solution which can be used on concretes. But please test before use, particularly on coloured concretes. This rust remover will erase surface rust spotting etc. It should be applied and rinsed off after use.

It is possible to use impregnating sealers to seal concrete which has some benefits. As previously mentioned they can be used to seal fully wet areas, or used as a pre-sealer before applying a dust proofer.

Pre-sealing, before applying a dustproofer, is an advanced technique and beyond the scope of this article. We recommend contacting us if you wish to pre-seal concrete before applying a dust proofer.

Please note that impregnating sealers do NOT dustproof concrete so are not discussed in detail within this article.

Further information


Please Click Here to view all our products & accessories for cleaning and sealing concrete. This includes all our handy ‘how to’ guides for cleaning and sealing interior and exterior concrete.

The information included in this article is not exhaustive. If you need further information please contact Floorseal on (01484) 861461 or email us our web address is