Surface prep recommendation

[Masterfabkirk]

I am prepping my floor of my NEW 60 x 40 shop for epoxy coating. The concrete has cured for past 8 months Arizona. I just finished filling the saw cut joints with Legacy Industrial Xtreme Set100. I then smoothed out the joint with a 7" 24 segment grinding wheel. It left surface scratches and grind marks in the concrete. Im concerned they will show thru the epoxy coating. It will be a two coat system. The Epoxy Im using is from Cohills, its the Pro Series Expoxy 2500, 61-63% solids by volume.
Im going to surface grind the entire 2400 sq ft floor with an EDCO Dual Disk grinder. What grit would you recommend ? the Rental company offers three grits, course, medium and fine. I was planning on the fine grit.

Questions 1. will the floor grinder smooth out the grinding marks ?
2. will the epoxy fill / cover any remaining marks ?

Desire is to have a very smooth finish with little to no surface marks.

 

[NitroShark]

That's a pretty Low solids content you are using. I would think even 2 coats would still show irregularities.

 

[Shea]

Get the actual grit #'s. 25 grit, 80 grit, etc.

 

[Masterfabkirk]

Id like to do a better quaility epoxy but Im at the end of my build and budget.
Still have two other projects to finish by AZ June heat. Hopefully the grind will reduce the imperfections showing thru

 

[Masterfabkirk]

My flooring advisor recommended 100 grit, Sunstate Rentals should have that