Hola,
EDIT: Added 40 to my Planex Process (Thanks @Cheese , I went and checked my stash and def been using the 40)
I went through this same exercise (actually, still have more to go!) So far about 1000 sq ft done. I couldn't be happier with how the floor came out.
I took days off of work to work on it:
Floor Belt Sander
I could spend a few (or more) hours renting a sander: driving to get it, load it up, get acquainted with it, then spend the time to bring it back.
Risk of digging in the floor is HUGE with those big belt sanders.
You also have limited time with the sander as its being rented.
Much easier in the act of sanding, just walking around.
Faster.
OR
Rotex
Get the Rotex; The time required for picking up and bringing back, I could be sanding.
No time limit, so not being rushed.
"Safer" for someone who isn't a floor sanding professional.
Oh, I also get a Rotex out of it when i'm done. <<Only Pro checkbox I needed
More blood sweat and tears while using it.
First sanding with Rotex 150 and 24grit (also had the "oh Sh!t" handle attached (495188)).
Followed by Planex with
40, 60, 80 and 100
Used a CT36AC with the Festool cyclone attached (didn't use the AC function, just HEPA filter and regular bags)
Used Berger Seidle Base Oil w/ No color, applied with trowel (small 10" Level 5 skim blade) and an Oreck ORB550MC and White pads( I was going to go Rubio, but my GAWD that gets expensive on the floors). I toyed with going with a white toned oil from Berger, but I thought about it and its just super "in" right now. Went with the plain base oil in the end, cheaper, easier, and classic.
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Super happy with how they came out.
LONG STORY OF HOW I GOT TO MY PROCESS
I did a
brand NEW qtr/rift sawn white oak floor with the Rotex 150 and the newer Planex. I mention this as it does impact the amount of effort (imagine would be "easier" for you if floor already flattened when installed). It took a good amount of Rotex effort to get rid of the dips and whatnot, especially where the ends of boards toungue and groove together.
IMO, you might not have to go as crazy as 24 Grit on the Rotex if you are just removing old Varnish/Finish.
My first attempt was to just use the Planex, with 24 Grit, with the CT dust collector pulling on full suction. Spent a bunch of time going over the whole floor, and in the daylight from above, looked great.
I then put down the festool raking light in the dark; oh boy, it needed a lot more sanding to really flatten out the tongue and groove, especially on the ends of the pieces where they meet. I bet the Planex could do it (there was decent duct in the cyclone after my first try), but i'd imagine youd need to sand for 24 hours straight.
So, after that failure, it was my excuse to buy the RO150.
***Heavens Opened and the Angels Sang***
So using the RO150 with 24grit, 202461 soft pad, flattened it out pretty quickly. It was indeed a workout though. I'm 43 (42 when i first did this method) and yeah, you feel it, but was legitimate Gym workout replacement. I did the sanding on my hands an knees, in the dark while moving the raking light around the areas, so it was easy to track which spots i hit. The rotex in aggressive mode, you just have to keep moving, but its still safer than the belt sander in one spot too long. With the rotex, i could take all my body weight and sand all around in an area, and it wouldn't even blink.
After the Rotex 150 (rotex 90 in corners) with 24 grit, I moved on to the Planex, with the "soft" pad (577252), highest CT suction (sucks it right to the floor), and i used the harness handle attached (just gives it extra weight and something else to hold onto). I moved through the grits,
40, 60, 80, 100, floor came out awesome. After having been on the floor with the Rotex, the Planex and using it while just up on your feet is like a vacation.

