Grinder unavailable. Is this floor etched enough?

[chiplee]

I've been reading here for a while, and finally had to register to ask a question. I know I'm shooting for a medium grit sand paper feel, but some areas feel that way and some don't, or is it some areas feel like coarse sand paper and some feel like medium, meaning it's all good? I don't know.

I'm a typical home owner on a DIY project. I have a 10 year old 640sq/ft surface with a few oil stains. So far I've used 3 gallons of Behr cleaner degreaser and 6 gallons of Behr cleaner/etcher (two separate 3 gallon treatments). It looks much closer to being ready after the second etching, but it still just doesn't quite look right. I'm in no hurry so if I have to go out of town for a grinder I will.

I've also included some shots of the areas that were oil stained. Up close they look more "ready" for epoxy than the rest of the floor. From a distance they look like there might still be oil in there. They pass the water drop test though.

 

[chiplee]

Oh, and as you can see a lot of the fibers in the concrete have been exposed by all of my scrubbing and etching. Can those stay there when I put the epoxy down or should I try to remove them?

 

[LegacyIndustrial]

Remove the fibers, burn them with a torch. They will stick up through the coating.
The minerals trapped in used oil can"stain" the concrete even once the oil itself is gone.

If the water test passed you should be ok.

I would still grind it, can't do too much prep.

 

[chiplee]

Remove the fibers, burn them with a torch. They will stick up through the coating.
The minerals trapped in used oil can"stain" the concrete even once the oil itself is gone.

If the water test passed you should be ok.

I would still grind it, can't do too much prep.

Ok, great. Thanks for the reply. The only readily available solution is probably this mounted to my angle grinder, but I'm not feeling the 640sq/ft grind with a 7" wheel, and I don't know if it's available with 100grit blades. Does anyone rent the larger ones by mail or anything? My Home Depot does not have this stuff for rent.

 

[LegacyIndustrial]

Ok, great. Thanks for the reply. The only readily available solution is probably this mounted to my angle grinder, but I'm not feeling the 640sq/ft grind with a 7" wheel, and I don't know if it's available with 100grit blades. Does anyone rent the larger ones by mail or anything? My Home Depot does not have this stuff for rent.

The proper grit for concrete prep is 25, for all the Diamabrush prep tooling. Look for another Home Depot or try renting the 10" single head edco machine, sunbelt and others should have the edco.

 

[chiplee]

The proper grit for concrete prep is 25, for all the Diamabrush prep tooling. Look for another Home Depot or try renting the 10" single head edco machine, sunbelt and others should have the edco.

Ah, I see. Seemed like everything I read on your website said "start with" 25grit. I was hoping that since I had already etched twice I could go directly to step 2 of the grinding process, whatever that is.

If it's 25 grit only then that'll work. It's a remote location. Nearest "other" Home Depot is 2 hours away. I can get down there but it's a pain. We do have a United Rental, so I'll check with them tomorrow. Thanks again for the replies.