Concrete grinding Epoxy Coat coming up.......

[cardr]

So it looks pretty bad in my garage at the moment. Every time I raise a car on the jack or use jack stands my floor peels up..... The problem stems from sealer on the concrete. However, what ***** is that I talked to Epoxy Coat about the proper preparation needed to get the coating to stick even though it was sealed. The steps I went through were the following:


1) Stripper/Degreaser to get rid of the sealer
2) Rented a diamond grinder from Home Depot...I believe it was the Dimabrush and went over the surface three times.
3) Multiple sessions of pressure washing to get all the gunk out.

Not knowing how aggressive the diamond grinder should have been I think was the issue. I got some dust from it....some scratches on the surface, but I don't think it dug in as much as was needed. The concrete was still really black. So, after all this prep Epoxy Coat agreed that it would be good to proceed. Only a couple weeks later it started peeling up. I went through a month of tests from Epoxy Coat for them to say that the sealer was still on the concrete and they couldn't do anything about it.

So, I guess I'm SOL and need to grind everything up. What piece of equipment is needed to take a big aggressive cut on the concrete to remove the sealer and get a surface that the new epoxy can adhere to? It seems that the concrete is really hard....

Thanks for your help/suggestions

 

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[shaun oriold1]

What piece of equipment is needed to take a big aggressive cut on the concrete to remove the sealer and get a surface that the new epoxy can adhere to? It seems that the concrete is really hard....

Thanks for your help/suggestions

You can use PCD segments to clear off the old coating, and re-grind with a better grinder than the Diamabrush. Something where you can add weight, and / or control the number of segments touching the floor to distribute the weight as little as possible. You should be able to drip water onto the floor and have it absorb right away. Not bead up. If your coating is crappy and brittle, you might be able to grind right away, and forgo the PCDs

Even with a proper coating, I tell my customers to use a piece of wood under their jack stands, jack, or motorcycle kick stand. ITs a lot of weight concentrated on a sharp piece of metal ( in some cases) Protect the floor!

 

[jaye944]

ITs a lot of weight concentrated on a sharp piece of metal ( in some cases) Protect the floor!

^^^ and bingo was his nameo !

 

[cardr]

Thanks for the replies.....do you guys know what other type of grinder that I could get?

Locally I searched our rental house and found an electric grinder that they claim is good for removing old coatings and sealer. It removes 1/32" which I don't know if that is enough or not, and weighs 233lbs. Then there is a gas one that weighs 335lbs with 65 lbs of ballast weight that removes 1/16".

 

[shaun oriold1]

Both will yield the same results. I sometimes add weight to my machines to increase the cutting. You can also maybe remove come segments to distribute the weight over less "teeth" on the floor. Rent whichever is cheaper, and closer.