For most home and shop applications we recommend a three layer epoxy coating system for maximum durability and lasting appearance. The primer coat would be BondTite 1101, a 100% solids epoxy with extremely tenacious grip strength. That would be followed with a coat of LiquaTile 1184, this pigmented (in your case pigmented black) epoxy will give your floor the ability to withstand shock and impacts, protecting the concrete. Finally a clear coat of BondTite 1101 to help resist abrasion and give your floor that high gloss finish. The majority of Wolverine Coatings epoxies are 100% solids, there is no water or solvents to evaporate, so what you buy and what you apply is what you benefit from 100% when it cures.
For 440 sq ft your floor system would have 3.0 gallons of BondTite 1101 and 3.75 gallons of LiquaTile 1184. For most colors those would be $525. With those recommended materials, combined you would have a floor coating system with a nominal thickness of approximately 24.6 mils (not including waste – material left on brushes, in cans etc.). The BondTite 1101 would be split evenly, with half being used as the primer coat, and the other half being reserved and eventually used as the top clear coat.
For floors with UV exposure you might want to use EnduraShield 2254 as the clear coat instead of the BondTite 1101, in which case the cost for all the epoxies and urethane would only be an additional $104. Even on floors without UV exposure you might want EnduraShield 2254 since it will also give you the extra benefits of curing crystal clear in addition to being harder and more durable than BondTite 1101.