How can I make yellow halloween hairspray show up more on dark hair?

Aimee: How can I make yellow halloween hairspray show up more on dark hair?
For Halloween I’m going to be Harley Quinn and I bought yellow hair spray from Spirit Halloween since I couldn’t find the right wigs/any affordable ones. I tried it on my hair, which is dark brown, but it showed up more green than yellow and faded out in 5-10 minutes. My friend says there’s a way to make it last, but she can’t remember.

Does anyone have any tips to make it show up more vibrant/last longer?

Answers and Views:

Answer by Girkin
The only thing i can think of is put loads of it in you hair…sorry i wasnt much help…

P.S. why do you even need yellow hairspray for Harley Quinn?