Hair help ! Plz answer?

okay so i bought this temporary pink spray on color for the ends of my hair and it doesnt show up in most spots. My hair is black and its naturally curly. I washed my hair this morning and i left leave in conditioner in it. And the pink color shows up in dry spots. What/why do u think it wont show up. or what shud i do. anything guys, whatever u want to say as long as its related to the problem