Applying simazine and get to the bottom of the jug and it is gummed up the bottom about an inch thick, almost a solid, can't even stir it with a stick. Do you think that made the rest in the jug weaker? I have another jug just like it and need to go out and spray tomorrow and was wondering if it would be OK to use? Can't get anymore til Tuesday and would like to finish spraying. What do you think?