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Posted: Tue Dec 11, 2018 8:38 pm
by Milesthomas
This morning I filled my 6mm joints between Kandla Grey 600x900 Indian sandstone slabs, I had to push all of the compound in with my hands and then sweep it up. When I swept it up I found that the edges were covered in dark marks, some look like my finger marks and also other marks where I had put my hands that now won’t come off
It was the normal geofix, could it be that some moisture has got into the compound?
Any ideas on what to do, with this fade with time? Or do I need to wait a couple of days then try pressure washing or will they need to be shot blasted?
https://ibb.co/xgWhBfs
https://ibb.co/jkcS138
Posted: Wed Dec 12, 2018 6:40 am
by exoticpete
geo fix oh dear ....
it will fade with time along with the geo fix :p not sure shot blasting is such a good idea though :laugh:
Posted: Wed Dec 12, 2018 1:55 pm
by Milesthomas
Thanks... so how long is a geofix-piece if string?
Posted: Wed Dec 12, 2018 2:51 pm
by Milesthomas
So how long do you think it might take to be gone?
Posted: Fri Dec 14, 2018 7:06 am
by dig dug dan
Milesthomas wrote:So how long do you think it might take to be gone?
About a year!
Posted: Sun Dec 16, 2018 12:41 pm
by Tony McC
You dare not put a pressure washer anywhere near GeoFix - it *will* fall apart, but, sadly, the stains wil remain, as a visible testament to its total inadequacy.
Those stains are, most likely, a residue from the doping oil used by GeoFix (and most smiliar one-part polymeric products) and they will dissipate over time, but as Dan says, expect that to be at least a year.
This year, I've seen a couple of successful fixes where a good quality oil-remover was used to noticeably reduce, and in one or two spots eliminate, the residue staining. It's all a bit hit and miss. I think the more porous stones are more resistant - I have a theory that the porosity enables the doping oil to penetrate deeper, allowing it to hide away froim the oil-gobbler. Also, honed/polished stone seems much harder to rid of these stains.
However, the good news is that the two more successful jobs were with......Kandla Grey! 
They are NOT 100% successes, just a noticeable improvement, and the thought at the time was that repeat treatments every 4-6 weeks *might* further improve the situation, but you have to be careful about just which oil-gobbler is being used. Some have an acid contenbt that could create other problems. The best result I saw relied on using the citrus-based (honestly!) OT8, avail;able online, I'm told.