powdery grout Problems

[Fliselege]

Is this the culprit?

 

[Fliselege]

I do hope this is powder in a tub & not ready mixed.

 

[clecktiler]

yes that bag is indeed the exact same product. I guess you can now confirm we bought some poor quality product??

 

[Fliselege]

To be honest if I've ever used it then it's slipped my mind so can't say, I just know from experiance that the materials MegaFlis, Right Price Tiles, Maxbo and ByggMakke (which is spelled wrong but sounds right) is cheaper than profesional shops for a good reason, quality. Most of the time I use Flisekompienets F1 Plan fug for rough finishes and PCI Nano fug from same shop for shiny finishes, so that I can reccomend. Some shops we use stock Mapei, never had a problem with that either. How are you getting on with removing the fug? I've got a Fein sitting here with a brand new diamond 2mm blade on it.....

 

[clecktiler]

Hi, I've scraped as much out as I can now. Some came out in soft powdery lumps where it had not stuck at all to the tiles so this goes right back to the adhesive wheras some had set rock hard and i was only able to scrape out a few mm depth.

Do you think these areas will be ok? - I mean the full width of the joint and 4 or 5mm deep. Will that be enough for the new grout to stick into on top of the old stuff??
I was going to wet all the joints with a sponge before I commence the new grouting because I'm sure there will be lots of dust still in the joints that the vaccume has not removed. Hopefully this will help the grout to stick better. What do you think?

As it happens I brought my cordless grinder which has a 115mm marchris c850 diamond blade on with me as i knew I was going to do this bathroom whilst I was here.
It works a treat for cutting awkward shapes but i wouldn't trust myself removing grout with it- one slip and it's another disaster...!!!

 

[Fliselege]

Well some tiles are only 6mm thick so a 5mm gap should be fine, but best to get as much out as possible to be sure of a solid finish. I wouldn't wet up the lines before starting the grout, can see that being more of a hinderance than a help, just go over the lines with a dry paint brush if you think it will help. If you really want to wet wash it out, let it dry 101% before you grout.

 

[clecktiler]

Ok I'll just brush it out then. Thanks for your help and advice.

 

[Fliselege]

No probs, best of luck