We opened Padoras box.

[blue-5]

I have a 1500 sq ft garage/ shop that had Sherwin Williams armor-seal applied 2 years ago by the painter when we moved in. The finish failed in very short order due mostly to what I believe was poor prep and oil contamination. The concrete is about 50 years old and has a lot of high and low spots. It is also very hard (high PSI).

We began to grind with a EDCO 10" single disc grinder (green 20 segment) and the brand new disc was worn flat before the floor was 30% ground and that took about 7 hours. We are having issues getting deep enough to flatten out the high spots so we cant get to the lows. I'm not expecting perfection but i hate the thought of doing all this work and the mess (OMG THE MESS) and ending up with a finish that is less then presentable. Do i need to get all the armor-seal off or can i go over it? What is the best solution to fill the expansion that joints as i have no idea how to remove the coating from inside the joints? Is there a self leveling product that can be troweled over the floor? I do use go jacks to move the cars for winter storage so i am worried about the stress of the small wheels.

I was originally planing on doing the Rocksolid finish but i think a more professional product is in order. Can any one offer some input?

 

[Radix2]

Can't help your actual questions, but I noticed that the green edco disks are hard bond diamond tools - this means that they are for soft concrete, for hard concrete they have orange disks - which are soft bond for hard concrete. http://www.edcoinc.com/products/accessories/10-general-purpose-silver-disc-and-adapter/

The thing is, typically hard bond diamond tooling does not cut hard concrete well, instead they glaze over and refuse to cut....so they last a long time but don't get much done. The soft bond will cut faster but will wear faster too. If it seems that it was cutting well, you might stick with the green, if it didn't, try the orange, it may get more done.

 

[LegacyIndustrial]

Removing coatings is tough business and I would be using medium bond dots or PCDs.
It sounds like you are using the wrong tooling for the job.
Talk to the folks that rented you the equipment.

These machines will not get every little piece of coating off. As long as the residual is "down tight" you can leave remnants.

Our xtreme-set 100 can be used for joints and cracks.
Good luck.

 

[Armorpoxy]

Agree, PCD's will make short order of coating removal, but the really dig deep into the floor and can cause quite a bit of heavy scratching which then will need lots of grinding to smooth out for a coating, unless you are doing a full broadcast to hide the swirl marks, so best to try a less aggressive tooling to see if that works.

Remember however deep you take it down will require that much more grinding to bring it back up.