Acid Marks On Limestone

[hmtiling]

Hello all. got a call today from a cleaner who has spilled an acidic descaler on a limestone floor i tiled a few years ago. Any ideas what can be done folks? Hope you're well @Lithofin BOB 😉

 

[J Sid]

I had a plumber smear silicon on some dark limestone and acid marked it. I cut and polished most of it out.

 

[Lithofin BOB]

Hi mate , any photos ,if this has cut into the stones, should be able to pad this back, matching the factory finish always a problem and if the floor has patinaed up this repair will lighten the effected tiles - sometimes. What finish is the stone?

 

[hmtiling]

It's tumbled classical flagstones 'minster'. getting some pics emailed now. cheers

 

[hmtiling]

 

[Concrete guy]

Your best bet with this is Silicon Carbide brushes. That will have etched the limestone and the surface will need taking back.

However as it's a "tumbled" stone you can't do that with flat pads hence the need for brushes.

You'll then have to restore any topical finishes or impregnating sealants that were originally used.

However, before attacking it mechanically it's worth trying a Chemical solution of bob has something.

 

[Lithofin BOB]

Does it have a topical sealer on , may be worth a full stripp back on one stone and see what effect we are left with!! Or In with the brushes as above for minster!!

 

[hmtiling]

Does it have a topical sealer on , may be worth a full stripp back on one stone and see what effect we are left with!! Or In with the brushes as above for minster!!

a couple of heavy coats of stain stop which i put on. not sure if the clients have topped it up. been about 3 years i think. what would you recommend stripping it with bob?

 

[Lithofin BOB]

I would test wax off , or similar, if after the wax off the blemishes are the same , then we may need mechanical as above, may be lucky if they got it up quick or she topped up or similar

 

[hmtiling]

Your best bet with this is Silicon Carbide brushes. That will have etched the limestone and the surface will need taking back.

However as it's a "tumbled" stone you can't do that with flat pads hence the need for brushes.

You'll then have to restore any topical finishes or impregnating sealants that were originally used.

However, before attacking it mechanically it's worth trying a Chemical solution of bob has something.

Which brushes would you recommend if it comes to that please?