Ashford Formula, the originator of densifiers. Cost for 5 gallons was about $150. The retailer said I could probably get by with ten gallons for my 2100 square foot shop floor. Luckily I had the foresight to bring home an extra five gallon can, which the retailer said I could bring back if I didnt open it. The concrete was a month old, the weather had been very dry, the application day was very dry and windy and 60 degrees. The stuff seemed to dry very fast in the windy conditions. We ended up using all three five gallon cans. We did not get it all squeeged off in a couple places, but like any surface coating, the excess that we left there will wear off soon enough.
We actually simply dumped it on, walking and dumping. another person broomed it around. We could have used a third person on the team, brooming. As soon as I got it all dumped on, I started brooming it around too. After about 20 minutes the surface suddenly got incredibly slick, even though we were ready for it, it caught us by surprise. At that point the directions instruct to spray on water and keep brooming/squeegying it around. When it gets slippery the second time, the process is complete and you are to broom/spray water/squeegy the remaining product off the edge of the slab. Its so easy to apply on new already cured concrete.