How to seal concrete pavers?

[Binkybill]

Hi. I'm needing to seal some newly laid concrete pavers. Ideally I was looking to protect both against stains and mould/algae without changing the look. 

I was looking at a natural penetrating sealer as this would not change the look and I thought breathability was important not to lock moisture and efflorescence in. https://www.bunnings.com.au/crommelin-4l-natural-diamondcoat-paving-and-concrete-sealer_p1560266

However after ringing the Crommelin number they also suggested considering

 

their water based sealer (https://www.bunnings.com.au/crommelin-4l-water-based-paving-sealer_p0962066) as this is film based. They said this would protect more against stains as well but would leave a low sheen look (ie change the look of the pavers) and potentially increase slipperiness. 

Now I'm not sure which to go for. 

Has anyone used either of these products or alternatives?

Also even within the 2 weeks of them being laid, they have acquired a few stains. Mild bleach solution hasn't done much. Is pressure washing the best way to remove strains prior to sealing. I would ensure the pavers were completely dry before sealing. 

Any advice welcome. 

[MitchellMc]

Hi @Binkybill,

I agree with the Crommelin technical team’s advice. Any film-based sealer that sits on top of the paver surface will give better protection against stains since it creates a physical barrier that stops contaminants from soaking in. A penetrating sealer, while excellent for maintaining a natural look and allowing the surface to breathe, will not offer the same level of stain resistance as spills can still seep into the pores before you have a chance to clean them up.

If your main priority is preventing staining, the film-based sealer would be the better choice, even if that means accepting a low sheen finish. 

As for cleaning before sealing, a gentle pressure wash is usually the most effective way to remove existing marks. Take care not to use too high a pressure as it can etch the surface of new pavers. Allow them to dry completely for at least 48 hours in dry weather before applying your chosen sealer.

Please let me know if you have any questions.

Mitchell