If that's the one you mix with water and then apply to the grass, not until the blades are dry, so probably tomorrow. I don't mean dry altogether, just dry after you've applied the solution rather than dry after rain. There should be some advice on the pack regarding pets and children.

Hi, welcome to GoY, if you want a decent lawn, permanently, Derek.

Good answer Derek, I like it.

Hi Myron, good to see you again, Derek.

If you have bare patches they will have been caused by dog urine so heed Derek's advice