Rotex on thinset

[jhall]

Has anyone used the 150 to smooth out thinset on concrete.   What kind of sand paper would work?  Trying to avoid buy a diamond disc for a grinder.  I gave gotten most of it off just trying get the rest.

 

[Alan m]

i dont know from personal use but some members on here have used ther rotexi on granite and sand stone etc. i think they used saphir paper in the roughest grit.
i f you look at the diagram on they different sand paper types it will show you which one is suited to which material.

 

[AlexThePalex]

You wrongly named this thread. It should be called "Rotex on thinset". Thinset and concrete are not the same by far. Forget about sanding concrete. But thinset should be removed just fine with Saphir 24, 36 or even 50.

 

[jhall]

Thanks for the info.  I was using the multimaster with it's carbide disc and a demo hammer drill to take the high spots.    I got lucky and most if the tile poped off with the thinset.  I think the used the wrong kind or a cheap brand.  I am going to try sapphire and post results.

 

[BMH]

I used the RAS 115 with saphir 36 grit with great and quick results. Used the Fein to finish the small corners. The RAS 115 is continuing to impress me with it's versality. I will be investing in a couple of fiber disk for it in the near futur.

Bruce

 

[jhall]

Dealer didn't have saphir.  So I used granit 40.  Worked for me but I didn't have alot to do.  I hope to get some saphir to have  on hand just in case.  Thanks for all the info and advice.

 

[Sean7a]

Dealer didn't have saphir.  So I used granit 40.  Worked for me but I didn't have alot to do.  I hope to get some saphir to have  on hand just in case.  Thanks for all the info and advice.

I'm interested to hear how the Granat worked considering it has ceramic in it.  Probably held up well.  Curious how it would have compared to a rough Saphir.

 

[tbellemare]

I used Granat P 60 on some Easy Sand on a wall. It cut right through it. I then skimmed the same wall with Laticrete 254 before setting tile. I wanted it to be real smooth and I'm not the best with a trowel so I used Granat P60 again to "smooth any ridges" that I left. Once again, it cut right through it, although a little slower. If I'm not mistaken, Granat's bigger grits (up to 120) are cristallized aluminum oxide. It makes them tougher and less prone to cracking or chipping.

I've used Saphir several times to shape limestone and also to take mortar off concrete, I'm a messy mason.

Tom

 

[tbellemare]

No, it isn't, Chris.

Tom

 

[jhall]

Granat work for what I needed, buy there wasn't much to sand.  There was water damage and the tile came off with most of the thin set.  Luckily some one didn't do it right.

 

[Cableaddict]

Reviving this old thread, with comment & a related question.

I just purchased an RO 90 DX.  I had hoped to use it (among more typical jobs) to remove a long, thin strip of latex paint from a  basement cinderblock wall. 

My dealer said it would work fine, in moderation, using Saphire course papers.
- But to be safe, I called Festool directly.  Their tech said that the rotex sanders are not sealed well enough to protect against concrete dust, and that in fact CONCRETE DUST WILL VOID THE WARRANTEE.

Granted, I want to remove paint, and the OP wanted to remove thinset, but in both cases you're going to also generate some concrete dust.
--------

Well, that was my comment.  I'm not sure what the question is.  Maybe: 
Will just a LITTLE dust really cause damage?
Can I clean-out the brushes, or whatever, afterwards?

 

[Brice Burrell]

I think your dealer has it right, in moderation you'll be fine.  I can assure you there are plenty of Rotex sanders that have survived far, far worse.

 

[oldie]

Hmm?  Wonder what Festool 'themselves' would say about the RAS.

 

[Cableaddict]

I think your dealer has it right, in moderation you'll be fine.  I can assure you there are plenty of Rotex sanders that have survived far, far worse.

Sure, but not if it voids my warrantee !

 

[ajones]

Hmm?   Wonder what Festool 'themselves' would say about the RAS.

[size=10pt]

Well that would depend which festool you talk to and which member of staff and the day of the month full moon ect....[/size]

 

[Brice Burrell]

I think your dealer has it right, in moderation you'll be fine.  I can assure you there are plenty of Rotex sanders that have survived far, far worse.

Sure, but not if it voids my warrantee !

I not saying you shouldn't be concerned about the warranty but I buy tools to work for me.  If I'm afraid to use them to get work done then there's no point.  I obviously can't speak for Festool but I'm assuming there issue with concrete dust voiding the warranty is more about everyday professional use, not a small, one time job.

 

[Cableaddict]

So do you guys serious think I'll be OK with this?

The job would be a strip about 4-5" wide, and 200' long.  It's cinderblock, not concrete block which means it's very pebbly, so I'll have to go about 1/4" deep.

I'd be going very slowly, with the CT 36 on high. I assume I'd be using Saphire 24 grit in Delta mode.

(And FWIW, I can't do this job wet, for complicated reasons)

- thanks.