I've used it and it works fine.

Yes. No. It's like waxing your car; do when you feel the need.

Hmmm.... the Italians who have been working with stone for thousands of years or an Aussie stonemason internet troll..... whom should readers believe?

This is not a stone but some man made stuff that IMO should not have to be sealed at all

R S Any sealer will harm the quartz surface it simply does not bind. Here are two photos from different jobs where we have had to repair the damage form sealers or color enhancers.... This is why they do not work.....!

The cloudiness in the photo above is attempting to clean the surface and because the sealers do not bind or set, they are then impregnated with the cleaning compound. Which causes them to set.

The issue is why they used it in the first place. They had etched the surface from using products like Gumption, BKF and Mould and Scum remover as most of the off the shelf cleaners including Green, Organic and Earth choice etc are all caustic. Meaning they have Sodium Salts in them and therefore have a high pH level.

These will damage any stone or surface overtime... so it is not isolated to quartz.

Formica is satin finish or matte, and why it will not show the damage but formica is basically cardboard that is printed and heat treated and attached to a timber or mdf substrate.

Again my question would be WHY not if I can use it!

Use the correct cleaner and you will be fine.... just remember that the likes of Caesarstone and they are not the only ones... Actually void their own warranties by recommending products that are outside the the pH levels or are solvents, harsh chemicals or abrasives. All of which void any manufacturers warranties.

If push come to shove, they have left themselves liable for having the stone replaced at their expense. As what they are recommending on one hand , voids the warranty in the other.

You have hit the nail on the head, why we would only recommend four major manufactures and you have named one. Note we have NOT NAMED any in this thread!

...........Forgive me...... I thought I heard a murmur from the gallery!

Just in case the gallery forgot!

[https://www.houzz.com/discussions/engineered-stone-heat-crack-dsvw-vd~5072157[(https://www.houzz.com/discussions/engineered-stone-heat-crack-dsvw-vd~5072157)

Sindy Wei does not matter the product, brand NO SEALERS can be used on quartz!

Also using any sealers on quartz voids the warranty. In the warranties of any manufacturer it will say void if any alteration to the surface, which is what a sealer does.

Not only that they do not bind nor do they set correctly, all sealer are only made for natural stone like granite.

My question would be WHY you need a sealer??

Yes you just need to look under our channel.

This is Caesarstone Sleek Concrete which the stains are applied to.

https://youtu.be/Sttr41nZVNw

Its both, prevents stains and fingerprint yet can clean any stain off.

Again we would advise you to stick to the european brands such as Technistone or Silestone but not the nboost range of silestone as it has issues at this stage.

One more question - are the stains and fingerprints indicative of particulate and bacterial contamination? Thanks

No, they are indication that you have a film or oil on the surface. You would need a blue light to see what the bacterial containmation is.

You could clean your counters with say our Stone Power Cleaner which will kill all germs and remove the contaminants as well, and then apply olive oil which has been sterilised. Wipe off with a sterilised cloth and you would still get fingerprinting. Your hand and skin carries bacteria they are need for a health environment, the good ones.