Amazing Acid-Safe etching kit contains everything you need to properly prep your concrete decks, porches or other concrete surfaces for coating with ArmorGarage Renew It coatings. Mix with 4 gallons water, sprinkle evenly over wet concrete surface and scrub in with stiff bristle shop broom, let sit 5-10 minutes, sprinkle TSP powder evenly over surface while wet, scrub in and rinse well. Let surface dry for 48 hrs minimum. Kit includes 2 lbs of high performance TSP powder, 1 gal of environmentally safe concentrated etching solution Includes stiff brush and gloves. Treats about 300-500 sq ft. Unique buffered mild acid solution has low fumes/odor and is safe for landscape and pets. Does a great job without the mess and dangers of traditional acids.