Acid Marks On Limestone

hmtiling · Jun 27, 2016

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 · Jun 27, 2016

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

Lithofin BOB · Jun 27, 2016

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 · Jun 27, 2016

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

hmtiling · Jun 27, 2016

Concrete guy · Jun 27, 2016

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 · Jun 27, 2016

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 · Jun 27, 2016

Lithofin BOB said:
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 · Jun 27, 2016

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 · Jun 27, 2016

ATSDiamondTools said:
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?

hmtiling · Jun 27, 2016

Lithofin BOB said:
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

Many thanks

Concrete guy · Jun 27, 2016

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

I'd probably go with #120 grit as it would be reasonably gentle but still remove some of the surface. If you need something more coarse you can drop down a grit or two. They aren't expensive but you'll need a variable speed grinder or polisher to use it on.

hmtiling · Sep 15, 2016

The wax off worked. Thanks guys

Dumbo · Nov 4, 2016

hmtiling said:
The wax off worked. Thanks guys

Had a similar one Mr muscle on terracotta it had only attacked the wax strip and reseal did it

Acid Marks On Limestone

hmtiling

J Sid

Lithofin BOB

TF

hmtiling

hmtiling

Concrete guy

Lithofin BOB

TF

hmtiling

Lithofin BOB

TF

hmtiling

hmtiling

Concrete guy

hmtiling

Dumbo

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