I tested a non-ionic surfactant (Bonide Turbo spreader sticker), at high and low rates during a hot spell, 94 degree days as high temps. I applied with a hand sprayer on a fine fescue Kentucky bluegrass mixture in light shade. I applied an equivalent of 2.3 gallons of solution per thousand sqft. I applied at the rate of about 1, 1.4, 2, and 8 percent. There was no injury to the grass. It appears to me that a non-ionic surfactant can be safely used even at high rates, and even in hot weather. What is your experience?