RAS 115 for paint removal/prep

[BMH]

Granat 60 and 80 should be a good starting combination depending on the quality of the paint and amount of mud that needs to be taken down. When removing multiple layers of latex paint you have watch out for your sanding pad overheating the latex paint as it will gum up the paper very quickly.

So slower speed, constantly moving your sander over larger surface and not applying much pressure on the sander is key. After that it is a game of patience letting the sander do the work and have a headset with good music playing.

 

[tbellemare]

Thanks for the quick response Tom!!

which sander do you believe would be the better option, Ro125 or ET125?

I think the Rotex in gear-driven mode will work great but it's kind of small if you're doing entire walls.

Reply #4 in this thread shows what 1 sheet of 90mm diameter P60 Granat can do to a backsplash. Oh, and I used speed 6 in gear-driven orbital on the RO 90. The house was built in the mid-70's.

Tom

Tom

 

[slopjock78]

I do not need to do the whole wall, just the mud joints.  the majority of the wall is just painted drywall board

 

[tbellemare]

If you have a DTS 400 or RTS 400, I think they're much better suited for what you describe. They are almost dust free on mud joints and very easy to handle... They are orbitals whereas, the ETS 125 is a random orbital and I don't think it does as good on drywall.

Tom

 

[slopjock78]

well its funny you mention that.  I was thinking about what my next sander might be, and it was down to the RO90 and the DTS400.  Sounds like this might be a good excuse to get the DTS400....

 

[tbellemare]

Even my wife is happy using it on drywall...

Tom

 

[slopjock78]

is it good for removing the paint as well, or just the mud once i get the paint off?

 

[AlexThePalex]

If you have a DTS 400 or RTS 400, I think they're much better suited for what you describe. They are almost dust free on mud joints and very easy to handle... They are orbitals whereas, the ETS 125 is a random orbital and I don't think it does as good on drywall.

The ETS125 is just as good with drywall as the DTS/RTS. Makes no difference.

You can also use the stronger Rotex 125, but due the higher removal rate the dust collection is less proficient than with above sanders. Can be easily remedied though with a slower speed setting and/or higher grit paper.

I would never advise anybody against buying a DTS, lovely sander, but if you have a RO125 and an ETS125 you're not entirely helpless against drywall.

 

[tbellemare]

is it good for removing the paint as well, or just the mud once i get the paint off?

The DTS/RTS will remove paint, texture, and float.

Tom

 

[slopjock78]

Just bought some Granat 60 so see how that goes.

They of course had a nice shiney DTS400 there calling my name.  I was able to resist.......this time

 

[slopjock78]

Just wanted to give an updated on the Granat 60.  It actually worked really well, but better on the ETS125 then the RO125.  I was having clogging issues on the RO125.  Tried slowing down the sander, tried different techniques.  It got better, but was still clogging some.  I switched over the ETS125 and had ZERO clogging after that.  Now, it of course was a bit slower then the RO125, but when i took my time it did what i needed it to.

Does anyone have any experience with Granat 40?  My dealer across the street has some of that on hand, and was wondering if it was worth trying on the ETS125.  My only complaint was it was a bit slower then i would have liked with the Grana 60.  wondering if 40 would help speed up the process without losing too much finish quality.  I am putting a skim coat on top when i'm done, so it will not be the finished surface after using the 40 grit.

 

[AlexThePalex]

You can use granat 40 on the ETS125 without problem. But if you're going with that low of a grit, it means you've got a tough removal job at your hands and I really wouldn't choose the ETS125 for that unless you've got the patience of a monk.

Your paper clogs more easily with the Rotex because it is more aggressive and puts more force on the paint, heating it up which makes it softer and makes it clog easier. But I would really prefer to use the more powerful sander and change papers a bit more often, because you're done a lot quicker.

A big problem with grits below 60 is they scratch the underlaying wood more, and you'll have to do more sanding with a higher grit to remove those scratches again.

I prefer to not go lower than 60 grit, but if I must, I use Saphir 50 on the Rotex 150 or RAS 115. Saphir 50 scratches a bit less than 40 grit paper, and because the paper is so tough, it removes paint faster than Granat/Brilliant/Crystal of equivalent or lower grits, and it lasts WAY longer. A Saphir disk costs double the price of a Granat disk, but can last between 10 and 20 times longer. It also doesn't clog very fast.

 

[slopjock78]

I dont have the patience of a hungry 2 year old, let alone a monk.  however, this isnt a paying job, just helping a friend out.  Any improvement I make he is thrilled with.  Also, i'm sanding painted drywall, not wood.  The toughest part is getting through the 3 layers of latex paint.  After that, brilliant 150 is my paper of choice and works great.  its just getting through that latex that is proving to be difficult.  The Granat 60 is working well, would just like to speed up the process while avoiding clogging if possible

 

[tbellemare]

If your Granat clogs, you might try wiping it with alcohol. That has worked for me before, (a customer showed me that during a demo'), and returned it to almost like new.

Tom