Discuss Anybody got an urgent solution in the Tiling Forum area at TilersForums.com

Cranbrook

Tilers' Arms Member
Messages
263
Location
Pontypridd, South Wales
My grandfather in law has recently finished a limestone job (pictured) and tried cleaning the stone with brick acid prior to sealing... He's in desperate need of a solution so if anyone knows a solution I'll be grateful to hear them :confused:IMG-20190415-WA0009.jpg IMG-20190415-WA0010.jpg IMG-20190415-WA0011.jpg
 
Last edited:

impish

Trusted Advisor
Tilers' Arms Member
Messages
5,188
Location
Preston, Lancs
Erm. He's killed it.
Good news is there is a product that will fix it.
Bad news - I forgot the name of it.
Bare with me....
 

impish

Trusted Advisor
Tilers' Arms Member
Messages
5,188
Location
Preston, Lancs
Trust me on this, there's no better product for this one. I can't say how I know, but I know!
(this product has been tested by rather miffed sealant companies who are going to copy it)
 

impish

Trusted Advisor
Tilers' Arms Member
Messages
5,188
Location
Preston, Lancs
Well I don't know then! He's basically bleached the dark pigments away.

I would call Bob at lithofin. He's the total expert in this.
 

pdc

Only a Handyman...
Trusted Advisor
Tilers' Arms Member
Messages
3,577
Location
Mijas, Malaga, Spain
Trust me on this, there's no better product for this one. I can't say how I know, but I know!
(this product has been tested by rather miffed sealant companies who are going to copy it)
Looking at the videos and how it restores acid marked stone it does look good.
 

impish

Trusted Advisor
Tilers' Arms Member
Messages
5,188
Location
Preston, Lancs
Limestone is actually pH neutral dissolved in water, but it is an alkaline agent.
The acid used had released /created calcium salts.

(that's technical for "he gone done goofed")
 

Huddersfield Tiling

Huddersfield Tiling
Messages
33
Location
Huddersfield
Limestone is mainly composed of Calcium Carbonate which has a pH of nearly 10 which makes it towards the high end of alkaline (14 being the maximum). Even weak acid solutions will cause a dissolving action, and even something like cola which is acidic can dissolve and stain the surface. Without an impregnating sealer, limestone remains vulnerable to any weak acid solutions over time (including acid rain in areas of high pollution).
 
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