Ceramic Tile Advice Forums - John Bridge Ceramic Tile

Welcome to John Bridge / Tile Your World, the friendliest DIY Forum on the Internet


Advertiser Directory
JohnBridge.com Home
Buy John Bridge's Books

Go Back   Ceramic Tile Advice Forums - John Bridge Ceramic Tile > Tile & Stone Forums > Cleaning, Restoration and Sealing

Sponsors


Reply
Thread Tools Search this Thread
Unread 09-06-2017, 09:12 PM   #1
homeownerguy
Registered User
 
Join Date: Sep 2017
Posts: 11
Black cleft slate, anything to do for this damage?

Hi All, I am now the owner of a house with cleft black slate floors that seem to have some sort of damage. To my untrained eye it like some sort of product was allowed to be left pooled and it damaged the the top-most layer on some of the tiles. Here are pictures of the most egregious examples: Name:  image1.jpg
Views: 252
Size:  24.1 KB

Name:  image2.jpg
Views: 243
Size:  42.4 KB

Name:  image3.jpg
Views: 249
Size:  41.2 KB

What might have caused this? Is there anything I (or a professional) can do to fix or hide this?
__________________
Maxim
homeownerguy is offline   Reply With Quote
Sponsored Links
Unread 09-06-2017, 09:25 PM   #2
homeownerguy
Registered User
 
Join Date: Sep 2017
Posts: 11
Just went back to check my assumptions and realized that the spots are not in the stone, but on top of it! Tried my 1in putty knife to scrape and it scrapes off. I stopped right there though to check on what the right tools would be to scrape off whatever these spots actually are. Any recommendations?
__________________
Maxim
homeownerguy is offline   Reply With Quote
Unread 09-08-2017, 10:56 PM   #3
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
 
Tool Guy - Kg's Avatar
 
Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 22,167
The most appropriate thing to use for a natural stone floor for routine maintenance is a stone specific pH neutral cleaner. You'll find such at most places that sell stone tile.

If you wanna start with something right away, start with water and a rag. Avoid anything that's acidic. No acid cleaners. No vinegar solutions.

__________________
Tonto Goldstein... but my friends call me Bubba

Help an awesome summer camp!
Tool Guy - Kg is offline   Reply With Quote
Unread 09-09-2017, 01:00 AM   #4
Jim Farrell Tiler
dont blame me i didnt vote for him
 
Jim Farrell Tiler's Avatar
 
Join Date: Aug 2004
Location: Dunedin New Zealand
Posts: 1,756
thats a word you dont hear everyday....egregious
__________________
Jim
Jim Farrell Tiler is offline   Reply With Quote
Unread 09-10-2017, 02:34 AM   #5
Davestone
Florida Tile & Stone Man
 
Join Date: Apr 2004
Location: Naples Fl.
Posts: 22,690
I heard it on t.v. once LOL
__________________
Dave



http://Davestonestile.com
Davestone is offline   Reply With Quote
Unread 10-03-2017, 11:24 AM   #6
homeownerguy
Registered User
 
Join Date: Sep 2017
Posts: 11
Over the last couple of weeks I tried a few things:

1) Putty knife scrapping. Kinda works, takes forever, smoothes out finish (like sanding), and doesn't produce great results. Abandoned it after a couple of these hard water deposits.
2) CLR and Vinegar. Didn't do a thing.
3) Sulfamic acid: 1 tablespoon per 1 cup of water, this started to produce results, but required 15 minutes of scrubbing per stain. Too long, as I have dozens upon dozens of them.
4) Sulfamic acid: 3-4 tablespoons per 1 cup of water. Taking a spot cleaning approach this allowed me to scrub off the hard water deposits in a fraction of time.

I paused again because I am facing another problem. The surface deposit seems to be gone (can't feel it with by running nail across it), but a lighter shadow of the original deposit can still be seen. Picture below.

What do you think this lighter outline is? Can it be removed, covered, or blended? Besides sulfamic acid, anything else I can try for other extreme hard water deposits that I have?
Attached Images
 
__________________
Maxim
homeownerguy is offline   Reply With Quote
Unread 10-04-2017, 07:16 AM   #7
John Bridge
Mudmeister
 
Join Date: Mar 2001
Location: Rosanky, Texas
Posts: 68,047
Send a message via AIM to John Bridge
Hi Maxim,

I think it might be a topical sealer that was used on the stone and not used correctly. If you can determine what it is you can obtain a stripper for it.

Once again, no vinegar or other acid products on the slate. It won't work, and it might damage your stone beyond repair.
John Bridge is offline   Reply With Quote
Unread 10-04-2017, 07:33 AM   #8
homeownerguy
Registered User
 
Join Date: Sep 2017
Posts: 11
Quote:
Originally Posted by John Bridge View Post
Hi Maxim,



I think it might be a topical sealer that was used on the stone and not used correctly. If you can determine what it is you can obtain a stripper for it.



Once again, no vinegar or other acid products on the slate. It won't work, and it might damage your stone beyond repair.


Thank you. I don't have contact with the prior owner, and doubt she would have info anyway. I found this in the closet. It's full, so chances are that it wasn't used.

http://www.afmsafecoat.com/products/...eal-semi-gloss

Other than that, what could I try to test the sealant theory?
__________________
Maxim
homeownerguy is offline   Reply With Quote
Unread 10-04-2017, 12:23 PM   #9
homeownerguy
Registered User
 
Join Date: Sep 2017
Posts: 11
Quote:
Originally Posted by homeownerguy View Post
Thank you. I don't have contact with the prior owner, and doubt she would have info anyway. I found this in the closet. It's full, so chances are that it wasn't used.

http://www.afmsafecoat.com/products/...eal-semi-gloss

Update: original tiler said he used Sealers Gold Choice on this tile. What would work to remove that specific product?

Other than that, what could I try to test the sealant theory?





Sent from my iPhone using Tapatalk
__________________
Maxim
homeownerguy is offline   Reply With Quote
Unread 10-05-2017, 07:37 AM   #10
stu rosen
Registered User
 
Join Date: Feb 2009
Location: New Jersey
Posts: 144
Your slate is most likely very dense(roofing quality) and not at all porous. You can easily test it by puddling a palm sized puddle of water on the surface(on a piece that hasn't been sealed). If there is sealer residue on the surface that can generally mean that it was misapplied and a sign that the material is quite dense. There are several ways to refinish(return it back to original finish) your stone. We would use a nylo grit brush 180 grit along with a high alkaline cleaner.Then we would finish using a 500 grit nylo grit brush to bring back the color. Final step may be a color enhancer but that depends on the stone. My best advice to you is to have a professional stone refinisher have a look at it.
__________________
Stu
www.stoneshine.com
stu rosen is offline   Reply With Quote
Unread 10-05-2017, 08:06 PM   #11
Azcleanfreak
Registered User
 
Join Date: Dec 2014
Location: Scottsdale, AZ
Posts: 33
Quote:
Originally Posted by John Bridge View Post
Hi Maxim,



I think it might be a topical sealer that was used on the stone and not used correctly. If you can determine what it is you can obtain a stripper for it.



Once again, no vinegar or other acid products on the slate. It won't work, and it might damage your stone beyond repair.


Why not acid?


Sent from my iPhone using Tapatalk
__________________
Brady
Azcleanfreak is offline   Reply With Quote
Unread 10-06-2017, 06:09 AM   #12
stu rosen
Registered User
 
Join Date: Feb 2009
Location: New Jersey
Posts: 144
We use acids on slate -we always test first but generally slates are acid resistant.
There is a good assortment of acidic products on the market that work well.
__________________
Stu
www.stoneshine.com
stu rosen is offline   Reply With Quote
Unread 10-07-2017, 09:16 PM   #13
homeownerguy
Registered User
 
Join Date: Sep 2017
Posts: 11
Quote:
Originally Posted by stu rosen View Post
We use acids on slate -we always test first but generally slates are acid resistant.

There is a good assortment of acidic products on the market that work well.


On my slate, I ran an experiment and left concentrated sulfamic acid until it dried out. Washed it off and couldn't tell side that was acid washed vs one that wasn't. Pretty sure the sample tile wasn't sealed either.


Sent from my iPhone using Tapatalk
__________________
Maxim
homeownerguy is offline   Reply With Quote
Unread 10-08-2017, 02:16 AM   #14
Azcleanfreak
Registered User
 
Join Date: Dec 2014
Location: Scottsdale, AZ
Posts: 33
99% of the time acid won’t harm slate. It is always good to test though.


Sent from my iPhone using Tapatalk
__________________
Brady
Azcleanfreak is offline   Reply With Quote
Reply

Stonetooling.com   Tile-Assn.com   National Gypsum Permabase


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Restore etched "cleft" India black slate? aprilq Cleaning, Restoration and Sealing 7 06-29-2010 10:05 AM
30 yr old black slate with dirty black grout cbell50 Cleaning, Restoration and Sealing 4 11-22-2009 07:25 PM
Can I remove bad slate tile job without damage? karen826 Tile Forum/Advice Board 8 05-01-2006 05:32 AM
Black Slate and Black Grout question Chloe B Cleaning, Restoration and Sealing 3 02-25-2006 07:18 AM
new cleft slate hearth - enhance? seal? Bfords Cleaning, Restoration and Sealing 6 08-25-2005 10:30 AM


All times are GMT -6. The time now is 10:02 PM.


Sponsors

Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC