spraying generic roundup and foliar fertilizer b4 projected rainfall this afternoon. how many hours b4 rain is ideal for product to work? and how much rain is too much after? the thing is could get 1 inch or more and by the time the ground conditions would approve of re entry theres rain chances again. the foliar is a n-p-k base blend with some magnese, sulfur, zinc and boron % as well in it and generic roundup is called bullzeye.