natural slate stone patio laid , grout haze marks on stone

Mart the landscaper · Jun 16, 2020

Laid a natural stone slate patio. Used projoint max expoxy paving grout used it for nearly 2 years. Yet after 6 hours sudden change in weather so went and covered and sheeted over as advised with water proof sheet. Came next morning removed and now got milky epoxy residue haze on stones. Any ideas as i rang manufacturers whos techincal said use white vinegar yeah i know i tried a sample but did nothing on the area although i was reluctant any suggestions job was only done saturday morning want to react quick

J K Tiling Cornwall · Jun 17, 2020

I'd get a nylon brush attachment for a hand drill, will try to attach a pic or link... if epoxy maybe use acetone? Does evaporate pretty quick though. Test on a off cut or area out of sight first. Shouldn't harm the slate.

[automerge]1592426119[/automerge]
... pretty certain toolstation stock them

Mart the landscaper · Jun 17, 2020

J K Tiling Cornwall said:
I'd get a nylon brush attachment for a hand drill, will try to attach a pic or link... if epoxy maybe use acetone? Does evaporate pretty quick though. Test on a off cut or area out of sight first. Shouldn't harm the slate. View attachment 112748
[automerge]1592426119[/automerge]
... pretty certain toolstation stock them

I will try anything any help appreciated will acetone be alright on natural slate stone you think ?

Dave · Jun 18, 2020

It doesn’t look like grout haze to me.
Is there a salt formation on the surface, does it cone off onto your fingers when you rub it. ?

Mart the landscaper · Jun 18, 2020

Dave said:
It doesn’t look like grout haze to me.
Is there a salt formation on the surface, does it cone off onto your fingers when you rub it. ?

We used the projoint max epoxy grout you can use in light rain it said weather forcast was fine so did it 6 hrs later on the evening weather suddenly changed unexpected and not indicated it advised in heavy rain to cover up so we completely covered at 10pm and 9 am nect morning removed covers. The manufacturer said yesterday its known as white blooming which is rare but dont seem to care said it could be from moisture they really dont know and have suggested to try LTP solvex as vinegar hasnt worked they dont seem to know and are not returning our calls all instructions were followed correctly i will check today about the salt question and post back thank you. Tried ecoprotec yesterday thats done nothing either was also told to try that. Rather concerned at the min.

Mart the landscaper · Jun 18, 2020

Mart the landscaper said:
I will try anything any help appreciated will acetone be alright on natural slate stone you think ?

Apologies its natural indian stone not slate
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Dave said:
It doesn’t look like grout haze to me.
Is there a salt formation on the surface, does it cone off onto your fingers when you rub it. ?

Also my mistake its natural indian stone not slate
[automerge]1592480895[/automerge]

J K Tiling Cornwall said:
I'd get a nylon brush attachment for a hand drill, will try to attach a pic or link... if epoxy maybe use acetone? Does evaporate pretty quick though. Test on a off cut or area out of sight first. Shouldn't harm the slate. View attachment 112748
[automerge]1592426119[/automerge]
... pretty certain toolstation stock them

Apologies brush great idea doing that the stone is not slate its natural indian stone

Dave · Jun 18, 2020

Mart the landscaper said:
We used the projoint max epoxy grout you can use in light rain it said weather forcast was fine so did it 6 hrs later on the evening weather suddenly changed unexpected and not indicated it advised in heavy rain to cover up so we completely covered at 10pm and 9 am nect morning removed covers. The manufacturer said yesterday its known as white blooming which is rare but dont seem to care said it could be from moisture they really dont know and have suggested to try LTP solvex as vinegar hasnt worked they dont seem to know and are not returning our calls all instructions were followed correctly i will check today about the salt question and post back thank you. Tried ecoprotec yesterday thats done nothing either was also told to try that. Rather concerned at the min.

Blooming will happen if water is in the stone and sealing was carried out before fully dry.

Mart the landscaper · Jun 18, 2020

Dave said:
Blooming will happen if water is in the stone and sealing was carried out before fully dry.

Any ideas at all the stone seemed all dry

Dave · Jun 18, 2020

Mart the landscaper said:
Any ideas at all the stone seemed all dry

How long after laying and cleaning did you seal it

Mart the landscaper · Jun 19, 2020

Dave said:
How long after laying and cleaning did you seal it

Laying was finished around 4 days prior to sealing as we then installed a fence after that

Mart the landscaper · Jun 20, 2020

Dave said:
It doesn’t look like grout haze to me.
Is there a salt formation on the surface, does it cone off onto your fingers when you rub it. ?

Hi tested today it does not rub off onto fingers it seems to be in the stone from covering over

Dave · Jun 20, 2020

Mart the landscaper said:
Hi tested today it does not rub off onto fingers it seems to be in the stone from covering over

You need to strip the sealer , leave to fully dry abd seal again. Then don’t let it get wet for 72hrs.

Mart the landscaper · Jun 20, 2020

Dave said:
You need to strip the sealer , leave to fully dry abd seal again. Then don’t let it get wet for 72hrs.

How can i strip it we hace tried numerous suggestions nothing is doing it. I tried as advised on here acetone. I tried thinners . I tried ecoprotec. I tried LTP solvex. I tried vinegar. I tried cif. I have tried nylon brush on drill like advised. Spoke to many people suggesting all the above what do you recommend to remove it. Looks like moisture has come out of the grout made contact with the covering PVC sheet and and run down into the natural Indian stone it is not slate and nothing seems to be shifting it

Dave · Jun 20, 2020

Mart the landscaper said:
How can i strip it we hace tried numerous suggestions nothing is doing it. I tried as advised on here acetone. I tried thinners . I tried ecoprotec. I tried LTP solvex. I tried vinegar. I tried cif. I have tried nylon brush on drill like advised. Spoke to many people suggesting all the above what do you recommend to remove it. Looks like moisture has come out of the grout made contact with the covering PVC sheet and and run down into the natural Indian stone it is not slate and nothing seems to be shifting it

@Lithofin BOB any ideas mate.

Mart the landscaper · Jun 20, 2020

Dave said:
@Lithofin BOB any ideas mate.

Also if you scratch your finger nail on it seems to spread in the stone yet leave a small white/grey flour/dust type texture on your finger take sa lot of work to scratch at it on a little cm spot and just spreads further more than anything seems on the stone if i cant come up with some ideas im gonna have to rip the patio up and relay the whole lot costing around 5 grand any posts welcome please as i have not received that many comments on it im open to ideas as its just awful all over the patio. I think 1 lesson learnt next time i will just grout a small area at a time as i got it all done in a day and have always used this and never had a problem its deffinately down to covering it up like the manufacturer suggests if unexpected weather change. I spoke to the manufacturer they said you did the right thing covering it up and now this. If i knew a company who could come in and sort it i would pay them to remove it if i knew they could succeed. On the day i checked all weather reports was fine and 6 hours after i finished a sudden change in the wether with no sign of it til then so i had.no choice but to protect grout and joints very frustrated any help and expertise greatly appreciated

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