I sprayed a large leaf with water. I added detergent as a surfactant and sprayed the leaf on the right, for comparison. Plant was Hosta. I used Dawn detergent, at one-third ounce per gallon. This would be about a quart per hundred gallons (probably far in excess of the amount needed). Fine for use in spot spraying or low volume where cost is mainly in the labor--not the surfactant. The spreader-sticker action was obvious. But I am thinking a comparison test with real weeds and herbicide with and without a surfactant or spreader-sticker would be the best way to decide if sticker is need and if it is worth the cost. Waiting for your pictures, using you favorite product. Which weed do you think is most difficult to wet?