I purchased the 5 Gallons bucket to cover 800 SF of a 5 yrs old concrete driveway. The 5 gallon bucket comes with 5 small bottles (about 7 oz each) of hardener, in case you want to mix smaller quantities. At 75 degrees, I applied it with roller (no need to clean tools) and it was easy. Foamy edges, uneven coverage, spills etc disappeared within minutes. Applied 2nd coat after 3 hours. The next day everything looks good – Not tacky or slippery.