Here is my video on how to epoxy a concrete countertop with Glasscast 3 self leveling epoxy resin. Here's where to get the epoxy from: 5kg Pack - https://amzn.to/2UQHZo9 1kg Pack - https://amzn.to/2LjwqX6
You will need approximately 2kg per m2 of surface to achieve a tough ad level 2-3mm thick coating for the countertop. Epoxy has is more fracture resitance than the concrete itself and will make the surface foodsafe and much easier to clean. This is without a doubt the strongest and I think the best looking finish for a concrete countertop.
Other Supplies for this project:
Tile Adhesive Spreader - https://amzn.to/2ITRdPc
Digital Scales - https://amzn.to/2IVW6Ht
Plastic Mixing Pot: https://amzn.to/2Ljt3zt
Disposable Paint Brush - https://amzn.to/2DLrbt7
Good Quality Respirator - https://amzn.to/2ISgvwX