Edco dual disc Magna trap grinder

[MACbox]

About to grind the floors on my small barndominium/cabin, to get ready to either do Armorpoxy or Nohr-S. Only have about 800 sq ft to do. The slab was done about 16-17 years ago, and was painted with a coat of Ace Hardware Oil based floor paint (I found one of the cans that the previous owners used).

I don’t expect the paint to be too difficult to remove, but wanted to ask about what kind of inserts would be best for the grinder?? The rental place has 30 grit and 70 grit Dyma-Dot diamond inserts, for both hard and medium concrete.

There are a couple of rough spots on the slab, where I’d like to perhaps take off an 1/8 of an inch of material, but otherwise, I’m not looking to do anything too aggressive. Thoughts on grit selection???

Also, is the Nohr-S an option for this space, or will I have ongoing issues with fumes?

 

[LegacyIndustrial]

About to grind the floors on my small barndominium/cabin, to get ready to either do Armorpoxy or Nohr-S. Only have about 800 sq ft to do. The slab was done about 16-17 years ago, and was painted with a coat of Ace Hardware Oil based floor paint (I found one of the cans that the previous owners used).



I don’t expect the paint to be too difficult to remove, but wanted to ask about what kind of inserts would be best for the grinder?? The rental place has 30 grit and 70 grit Dyma-Dot diamond inserts, for both hard and medium concrete.



There are a couple of rough spots on the slab, where I’d like to perhaps take off an 1/8 of an inch of material, but otherwise, I’m not looking to do anything too aggressive. Thoughts on grit selection???



Also, is the Nohr-S an option for this space, or will I have ongoing issues with fumes?

30 grit. I don’t think that machine will remove 1/8” but give it hell.

I haven’t heard of these ongoing issues with our product...But to answer your question, ventilate during install and during curing process for the win!

Good luck and be sure to post pictures.



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[MACbox]

Thank you for the info.

Yeah, I realize the grinder is not made for serious removal of concrete, but think they mention about 1/32” per pass. Hoping if I go over the “problem” areas 3-4 times, I’ll get what I need. We’ll see!!

The Nohr-S is about 4-5 mil per coat, correct?? So 2 coats of color and a coat of clear (from one of your kits) should get 12-15 mil??

 

[LegacyIndustrial]

Thank you for the info.

Yeah, I realize the grinder is not made for serious removal of concrete, but think they mention about 1/32” per pass. Hoping if I go over the “problem” areas 3-4 times, I’ll get what I need. We’ll see!!

The Nohr-S is about 4-5 mil per coat, correct?? So 2 coats of color and a coat of clear (from one of your kits) should get 12-15 mil??

Correct.


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[MACbox]

Thanks again. Grinder shows up tomorrow. Sounds like I can get ALMOST as thick with your Nohr-S product (15 mil) as I could with epoxy (around 20), and I know the recoat times are much quicker with the polyurea. Also like the fact that the Nohr-S doesn’t have to be mixed, so I can use the product as needed, rather than a “use it or lose it” scenario with a mixed batch of epoxy.

Obviously, this will be in a cabin, not a garage, so durability/chemical resistance issues are not as much of a concern (hard use), but any other application/cosmetic issues that should really make me lean one way or another (polyurea vs. epoxy)??

 

[LegacyIndustrial]

UV resistance and you nailed the #1 reason people buy it.... It's easier. lol

 

[MACbox]

The grinder worked fine with the 30 grit dots. Got most of the rough stuff out with several passes over the rough areas. I wouldn’t recommend the Edco if any serious/large removal of concrete was necessary, though. At least, not with the dots.

I’ve got a large shop vac, supplemented with a Dust Deputy cyclone. Honestly, the Edco spins slow enough that it doesn’t create any serious airborne mess (with the dots). The same can NOT be said for my 6000 rpm Makita 7” grinder equipped with a Diamabrush. The shroud I have on it is metal with a velcro/vinyl ring. Despite being hooked to the vac, it STILL fills the air with a heavy cloud of dust after 30 seconds. I shut it down, and have ordered what I HOPE is a more effective shroud for it. The Diamabrush works great, but is messy. I will also try a cup wheel to see if that creates less dust. If neither work, I may invest in a variable speed 4-5” grinder, in hopes the lower speed will create less dust.

One disappointing thing about the Edco is that it is about impossible to get closer than 2-3” of the wall ground properly. The discs that hold the dyma dots don’t come close to the edge of the shroud so it leaves a decent amount of grinding to be done by hand around the edges of the room.

 

[Armorpoxy]

Your grinder experience is exactly what we tell clients to expect. Just a caution about the 30 grit can leave swirl marks that a coating may not cover, so another pas with higher grits may be required.

 

[MACbox]

I asked about the thickness of 2 color coats and a coat of clear of your Nohr-S, in a question above, thinking originally your kit had 1 coat primer/2 coats color/1 coat clear.

I confirmed with you that the kit is actually 1 coat primer(pigmented)/1 coat color/1 coat clear.

What’s the DFT of your pigmented primer?? About the same as a coat of Nohr-S (4-5 mil), or is it significantly less?

 

[LegacyIndustrial]

3-5 mils.
As long as you eyeball the floor when done preparing and look for any ridges, you should have a great outcome. Find some? Flatten them out with the grinder before priming.

 

[LegacyIndustrial]

3-5 mils.
As long as you eyeball the floor when done preparing and look for any ridges, you should have a great outcome. Find some? Flatten them out with the grinder before priming.

Check this link.
Customer had a pretty-terrible floor to start. Turned out very well.

https://www.instagram.com/p/B79kiA2FODe/?igshid=1knhgwlwow2d8



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[MACbox]

Did some grinding around the edges of the rooms the past few days (this project is 2 hours away from my home, so is taking a while).

1) Got a Bosch variable speed grinder from Tools Plus. New ones are $150 plus. This was a “reconditioned” unit for $79.50. Looked brand spanking new. One year warranty.

https://m.tools-plus.com/bosch-gws13-50vsp-rt.html


2) Dastool dust shroud off Amazon. Works like a champ.

3) Kseibi turbo grinding wheel off of Amazon. Most cup wheels are $40-$50 at the box stores. Plenty of options for $15-$20 on Amazon. Also worked fine.

4) Decided to try some “high efficiency” filter bags for the Shop Vac. I already have a Dust Deputy cyclone, but this made a HUGE difference. Put a new filter on the shop vac (used in addition to the bag) and didn’t have to beat it out even once during the grinding. Bag/filter/cyclone combo is the way to go. Little to no dust in the air.

In summary, the new grinder shroud, combined with the lower speed of the variable speed grinder (ran it about 4-5000 rpm), plus the bag/filter/cyclone combo, really cut down on the dust creation.

The Edco only got me within 3-4 inches of the walls. The handheld setup got me within 1 inch. The shroud is a 5”, and the Kseibi wheel was a 4-1/2”. I’ve got a 5” wheel coming that will get me a hair closer.

I’ve got a new Makita 1/3 sheet orbital sander that I’ll run around the perimeter of the room to knock the gloss off that little remaining strip of floor paint. It’ll be up under trim, anyhow, but want to avoid adhesion issues. The Makita is a pleasure to use as well. Very quiet and little to no vibration in the hand.

https://www.homedepot.com/p/Makita-...RGzmDU3Nzae7nKCvmgBoC5t0QAvD_BwE&gclsrc=aw.ds



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