What type of coating are you planning to apply? Power troweled surfaces are very smooth and dense. As a result, they are known for being the toughest to etch properly. The Eco Etch may not get the job done. If you want to give it a shot, I would recommend scrubbing the Eco Etch in with a floor maintainer as they show in their video in order to get the best results.
Solvent based coatings like HellFire typically get better penetration than water-based and high solids coatings. You most likely will be OK. Just do a water test first to make sure the concrete absorbs water well before you coat. I would recommend checking with Scotty at Legacy Industrial as well.