i do commercial lawn mowing. recently i subcontracted my lawn spraying to a company here in wisconsin. i just had them spray one lawn so far to try them out. the lawn has dandalions all over, and they used horsepower weed control at 1.1 oz/1000sqft and uflex liq fert at 1.75 gal/1000sqft anyway, its been 7 days and the dandalions are all looking just fine still, they arent wilting. so my question is, does it take longer than 7 days using horsepower? you guys think i should keep using them? i have to pay them now and im just waiting for the customer to complain her weeds are still there. any insight/comments greatly appreciated. last thing i want them to do is spray 10 lawns of mine and have to pay them even though the weeds are still alive and well.