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Concrete prep questions

calicrewchief

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Joined
Sep 3, 2015
Messages
6
Hello! My name is Matt. I want to start by saying that this forum is fantastic! Tons of helpful info and motivating work. I can't stop flipping through all the great threads.

To give everyone an idea of what I'm dealing with. My home was built in 75. My wife and I bought it for our first home in 2010. Right after we moved in I wanted to do something with the garage floor because it was a mess. So, due to my lack of experience, appealing ease and price, I chose to apply the Behr epoxy kit. During which I was assuming the whole time that it would self level and fill in all the cracks and pits. I also only acid etched the 35 year old floor. As you all can imagine, it turned out to be a disastrous waste of time and money. I've finally decided enough is enough and I'd like to tackle the project again. My overall goal is to have a flat and glossy, solid colored surface. I want it to hold up against automotive chemicals and tire abuse. I obviously don't expect it to last forever. I understand everything has its limitations.

My plan is to grind down the surface and remove the old epoxy coating and take down the high spots. After filling the cracks, I plan on laying down a polymer modified self leveling cement to fill all the pits and achieve the level surface. From there, I still haven't made my decision if I want to apply a sealer or paint.

What I'm not sure about is the grinding. Should I expect results that will be enough prep for the polymer cement? I was planing on renting a HD buffer with the diamabrush pad, but after reading some posts recently it sounds like it might not work well enough for my situation. The other idea I read was using a grinder with the 7" diamabrush pad over the whole garage floor. I'm including some photos of the floor in it's current state. Any suggestions would be greatly appreciated.

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gregtwojeeps

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Jul 30, 2013
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5,096
Location
Ky
The HD unit will have a hard time getting that floor down the way you want it. I rented a 120 volt contractor grade 7 in. grinder for my floor grinding to remove 40 years of paint coats ... just to get it ready for me to put porcelain tile down on it. Piece of cake for it to cut down smooth. Of course they have larger units for larger floors, mine was just a one car garage.
 
Last edited:

Shea

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Sep 19, 2012
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Location
California
The Diamabrush is great for prepping the surface as is, but it's not designed for heavy grinding such as removing high spots and smoothing out pitted areas. If your local Home Depot has a 10" single disc Edco grinder, it would be much better at taking down high spots. It will also do a better job at smoothing out a lot of the mild pitted and spalled areas that can be seen in your pics.

Once you grind and fill your cracks, you may find that you would be better off applying a primer followed by a 100% solids high build base coat with a gauge rake to fill in the smaller irregularities and smooth the floor out. It just depends on how the floor turns out after the grinding. You could then apply a coat or two of tinted polyurethane to get that glossy look and great chemical and stain resistance. A floor like that would last you years.
 

59'trump

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Apr 27, 2013
Messages
51
What is the best product/application to fill cracks? I have an older slightly heaved garage floor that could use some attention. Although I'm not willing to spend a fortune, this method sounds like a good start and something that I could reasonably complete without dropping too much $$$$ (notice the four digits that I'm not willing to spend)
 
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Armorpoxy

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Aug 18, 2013
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Location
NJ
Hi,
A Diamabrush will do very little to fix this floor, you need yo rent a heavy diamond floor grinder. Most tool rental places rent them.

A good self leveler or patch product could work, but if you are located in a freeze/thaw area they can pop off, taking a coating up with it, so better to try to stay away from them, we have seen many failures, even with the best prep steps taken.

Fill cracks with something like our Crack Repair Epoxy Putty, then prime with something like our Armorclad Primer. Skim over with 100% solids epoxy and squeegee tight to the floor to fill low spots. Once done then coat the floor with the coating system like our Armorclad or similar products.

Pm us if need a quote on the package. Thanks!
 

59'trump

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Joined
Apr 27, 2013
Messages
51
Thank you guys for the info. Looks like we've got the pros chiming in!


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6T9427

Member
Joined
Jan 12, 2011
Messages
5
Try a few test patches to determine if you will be happy with the outcome. If the concrete is not dense enough most products will fail. A commercial traffic bearing membrane might be an option some are more flexible than epoxies.
Most coatings are not good for slab on grade due to ground moisture will be trapped in the concrete under coating.
Think long term.
I would look into some of the interlocking garage floor tile, does not need to bond to the floor and will hide a lot more than any surface applied products. Easy to repair and doesn't peal or chip. Commercial floor tile may work too.:3gears:
 
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