Question 1

1. What’s the difference between a concrete sealer and a concrete sealant?

Accepted Answer

A concrete sealer is a liquid designed to protect a broad concrete surface, either by penetrating or forming a thin film over it, to block moisture and wear. Meanwhile, a concrete sealant is typically a thicker, flexible material used to fill joints or cracks and accommodate movement. Sealants are not suitable for surface protection across wide areas.

Question 2

2. Can I use a concrete sealer on inside floors?

Accepted Answer

Yes, many sealers are suitable for interior floors, but it’s always best to check the product's specs before you use it to make sure it’s appropriate for the job in hand.

Question 3

3. How long does a concrete sealer last?

Accepted Answer

Service life varies by product type and usage, but most sealers last from 1–5 years depending on surface traffic and exposure. As a rule of thumb, you can tell you need to reapply sealer when water no longer beads on the surface of the concrete.

Question 4

4. Can I get a concrete sealer for painted concrete?

Accepted Answer

Yes. Some sealers are suitable to use on painted concrete. Not all of them are though, so it’s best to check the manufacturer’s specs to make sure.

Question 5

5. Do I need a separate product to seal a concrete driveway?

Accepted Answer

Yes. Driveway surfaces face UV, oil and weather exposure that indoor areas don't. So using a concrete sealer formulated specifically for external, high traffic use is advised. Look for a product labelled as a ‘driveway sealer’ or ‘concrete driveway sealer’.

Question 6

6. What’s the best waterproof concrete sealer?

Accepted Answer

If you need to create a waterproof seal for concrete, penetrating sealers (e.g. siloxane) work well on exposed surfaces. For full waterproofing, combine with good drainage and joint protection.

Question 7

7. Can I use a sealer for cracks in concrete?

Accepted Answer

No. For cracks you should use a specialist sealant or crack filler, often polyurethane based, that remains flexible and bonds to the crack. These products accommodate movement and prevent water ingress. General-purpose concrete sealers are not designed to repair cracks.

Concrete sealer

KA Tanking Slurry 25kg

Azpects Easyseal Contract Block & Concrete Sealer 5ltr

Thompson's One Coat Concrete Seal 5L

Sika 2 Waterplug Leak Sealing Admixture 5L

Bostik Concrete sealer, 5L Jerry can

RIW Liquid Asphalt Composition 25L

RIW Liquid Asphalt Composition 5L

Ultracrete SCJ Bitumen Cold Joint Sealer And Tack Coat 750ml Can

Bostik Cementone Resin Based Paveseal 5 Litre (30812235)

Bostik Cementone Water Seal 5ltr

Everbuild 402 Water Seal 5L

Ronseal Thompsons One Coat Water Seal - All Sizes

Thompsons 5ltr Water Seal 32991

Ardex WPC Waterproof Protection System 10kg