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Old 03-03-2010, 06:00 PM   #1
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Should I keep grinding my floors?


I am putting down an epoxy floor and wanted to level my garage floor. Apparently I used the wrong stuff and put down a self leveling underlayment instead of a self leveling topping. It had ridges but was fairly level. I wanted to get rid of the ridges and someone on here recommended that I rent a floor grinder to grind them off. As I'm doing so, the ridges are gone, but the blue primer is showing through in many places. The epoxy will cover this up but here's what I'm wondering. Obviously, I no longer have one continuous coat of the concrete on top of the primer. Do I need to keep grinding until it is all gone? Also, is the primer a sealant? Do I need to keep grinding until all the blue is gone? The primer is rough because of the stone I'm grinding with so will the epoxy primer stick to it? Please help. I have to get this done tonight so I can return this equipment tomorrow. Thanks.

Blake

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Old 03-03-2010, 06:08 PM   #2
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Should I keep grinding my floors?


One other note. I used Mapei Novaplan 2 and the primer is Mapei 1K.

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Old 03-03-2010, 09:25 PM   #3
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Should I keep grinding my floors?


well, I grinded as much as I could. There is still a little blue but oh well. It's porous so I think the epoxy primer should stick fine.
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Old 03-05-2010, 08:39 AM   #4
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Should I keep grinding my floors?


I know it's too late, but I think it will work fine for you.
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Old 03-25-2010, 01:38 PM   #5
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Should I keep grinding my floors?


The key issue in your case is not whether there is a little of the old material on the surface. It is whether the surface is porous. Splash a few tablespoons of water in various areas. If the concrete turns dark quickly you are good to go. If it beads up, you've got more grinding to do.

You will probably be OK even if there is a small percentage of the old material on the floor IF the grinder has scuffed up the surface so that a good quality epoxy has something to grab onto. (Don't go with the cheap stuff. You will regret it later.)

Patrick Dowd
California Concrete Restoration
http://www.squidoo.com/epoxygaragefloors
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