10" disc for EDCO - which one?

[bdk1976]

Just picked up a used rental EDCO 10" (electric 1.5HP). It currenty has a green grinding disc about half used up on it.

I plan to grind my month old 6" slab (4500psi/hard trowel finish) in preparation for epoxy. What is a good/best/recommended 10" disc for use with this machine/purpose and how many sq ft do they usually last for in practice?

 

[LegacyIndustrial]

25-30 grit, soft-bond should be acceptable.
Softer bond (metal that the diamond particles are encased in) is better for a harder floor.

 

[Armorpoxy]

Depending on your concrete type you may not need to purchase another plate as they can last thousands of square feet.