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The following article provides information on the different kinds of sealers you could use to seal Kandla Grey sandstones & other plain grey sandstones.
Kandla Grey sandstones & mid grey sandstones are usually totally plain or have minor colour variations. Colour variation might be visible as subtle veining contained within a single slab or variation in colour from one slab to another.
Plain grey sandstones cannot be colour enhanced with traditional impregnating colour enhancers, but we have an option to alter appearance (if required).
Kandla Grey sandstone is known to be potentially problematic due to oxidation of its natural iron content i.e. rusting. This type of sandstone can also become patchy if a traditional colour enhancer is applied.
If you wish to view the product pages of any of the sealers mentioned in this article, please click the product title highlighted in blue. There is other information at the foot of the page regarding user guides and other how to guides.
Kandla Grey sandstones or plain grey sandstones have a different mineral content to more colourful sandstones. They are more likely to suffer from rusting due to the iron content within the stone. They cannot be colour enhanced (with a traditional enhancer) as there is little natural colour to enhance. This can lead to patchiness if a traditional impregnating colour enhancer is applied.
The first option for sealing Kandla Grey sandstone is to seal with an invisible, breathable impregnating sealer like Floorseal Natural Stone Sealer Breathe. This product does not alter natural appearance as the sealer is an invisible subsurface sealer. It is a water-based natural/matt finish product as it does not change the appearance of the stone (or create a sheen).
This product is best applied in two coats via a pump up sprayer. It is possible to apply within a few weeks of the patio being laid.
Ultimately personal preference will dictate which sealer is selected. But we believe sub-surface impregnating sealers like Natural Stone Sealer Breathe are preferable when sealing Kandla Grey Indian sandstone or plain grey sandstones. This product will resist water/oil-based staining and inhibit organic growth.
This type of sealer can be used as a pre-grout sealer and is compatible with brush in compounds, sand & cement mortar and lime pointing.
It is possible to alter the colour of a plain grey stone with one of our solvent-based sealers.
Floorseal Sandstone Wet Look Sealer will alter the appearance of plain sandstone; it is a safer way to colour enhance/deepen colour than using a traditional subsurface colour enhancer.
This sealer will resist water/oil-based staining & inhibit organic growth.
This product is solvent-based and will deepen colour as it penetrates the stone, it also creates a subtle silk finish. The product is best applied via pump up sprayer in one or two coats. If your patio is newly laid you should wait 4-8 weeks before sealing, this allows time for the base to dry and any settlement to occur.
This type of sealer should not be used as a pre-grout sealer but is compatible with brush in compounds, sand & cement mortar and lime pointing.
Whilst no type or brand of sealer can fully replicate the effect of saturating natural stone with water, you may be able to capture some of this.
If you wish to alter colour, carry out a test with Floorseal Sandstone Wet Look Sealer on your slabs. This sealer is safer for use on Kandla Grey sandstones when attempting to deepen colour.
Traditional subsurface colour enhancing sealers are known to have the potential to become patchy when applied to Kandla Greys, so we do not recommend their use. Sandstone Wet Look Sealer is not a traditional colour enhancer, so it is suitable for Kandla Greys.
All sandstones, particularly exterior sandstones benefit from sealing. Our first choice for sealing Kandla Grey Sandstone, or any plain grey sandstone, is Floorseal Natural Stone Sealer Breathe.
This sealer is an invisible breathable impregnating sealer. Its purpose is to protect the stone from the effects of weather, organic contamination, oil & water-based staining. The sealer does not alter the colour of the stone or create a surface sheen.
As Natural Stone Sealer Breathe does not form a surface film it is not visible on the surface. It is meshed into the pores of the stone, so seals from within.
Natural Stone Sealer Breathe is arguably the best (& most natural) way of sealing a Kandla grey or plain sandstone. It is also probably one of the easiest types of sealer to apply. To apply this product, we recommend application with a pump-up sprayer. It is possible to seal the stone within a few weeks of the slabs being laid, which is often desirable.
If you wish to try and deepen the colour of your slabs, we recommend applying Floorseal Sandstone Wet Look Sealer (when a colour change is required on Kandla Grey Slabs).
The sealer is a solvent-based topical sealer which can deepen colour and creates a subtle silk finish. The sealer will resist water & oil-based staining and inhibits organic growth.
Please Click Here to view our products & accessories for cleaning and sealing sandstone. This includes all of our handy ‘how to’ guides & user guides for cleaning and sealing interior and exterior sandstone.
Please note there are other products which can be used on your interior/exterior floors which may also be suitable. We stock sample sizes of our sealing products, these are available from the individual product pages under the select size options.
The information contained within this article is not exhaustive. If you need further information please contact Floorseal or email Info@floorseal.co.uk
