1) Go to Sunbelt Rental and get the single disc floor grunder (use truck, its heavy)
2) Grind your floor for an afternoon so its flat and smooth like a pool deck
3) Get a dewalt diamond grinder bit from lowes; its yellow, 6inch diameter and expensive (can sell you mine if you want)
4) Use that bit with your angle grinder to clean up the edges around everythnig
5) Go to Creative Paints on Huntley and get their Corranado 2 part floor epoxy
6) Mix and roll the epoxy accordingly
I would not use anything bought from a retail store for this project; other than tools for prep and application.
DO NOT WALK ON THE FLOOR UNTILL 24 HOURS HAS PASSED AFTER APPLICATION.
Even though you can it will leave tiny footmarks in the clear coat and will see them in certain light/angled.
Feel free to add color chips or have the epoxy color mixed up. I also added a clear coat top with an additional clear grit for more texture.
You should have ~$400 in materials/rental, 4hrs on prep, and 4hrs on application
Start the project WAY early so you can let the concrete dry -completely- from the wet grinding before applying the epoxy.