My friend who used to do a bit of hair dressing does my highlights for me we just use the jerome Russell bblonde kit with the highlighting cap. Usually I like them but as my hair is longer it didn't seem like enough bleach and may have left the bleach on a bit longer this time. It's gone all stripy! How can I fix this? I thought about using john frieda blonding spray (like sun in) to blend the darker bits, will that work? Any other ideas? Thank youu