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Tile Adhesive, Cement (Tile Mud)
Specialist Tile -Stone, Porcelain, Glass
Pietra Serena Sandstone 800x800mm help
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[QUOTE="Stuart_AC, post: 893839"] Don't know why I didn't do this earlier but I just checked back on some images I took prior to grouting (about 2 or 3 hrs after fixing the tiles) and see that the dark blotches are there so I can assume that it's not a grout stain. The blotches don't look as dark as they are now but that could be due to the dust on the tile or it could be that the stain has got worse. I'm about 90% sure that the tiles weren't marked prior to them going down - I have about 25 left so will have a look to see if any are marked. Nearly all of the marked tiles have the streak pattern diagonally across them like on the image which is strange. About half way through the job BAL changed their adhesive product - I was using BAL Stone PTB in grey and they stopped making it. I finished the job with BAL Pourable one in white and still have a selection of marked tiles on that area of floor too. I worried that perhaps I applied the pre-grout seal too early after laying and have sealed in moisture - some parts of the house were sealed within 2 days after they went down but the kitchen which is shown in the image wasn't pre-grout sealed for 2 weeks after laying. In any case you can get the tiles pre-sealed in a factory prior to delivery so I assume that pre-grout sealing isn't an issue. I'll contact BAL technical to see if they have any comment but I assume that they'll say it's not their product. Bob gave some useful advice earlier so I'll drop him a msg in the meantime to see if he's seen anything like this. Cheers [/QUOTE]
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Tile Adhesive, Cement (Tile Mud)
Specialist Tile -Stone, Porcelain, Glass
Pietra Serena Sandstone 800x800mm help
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