Quick and simple prepig options?

Hi all, can you tell me what you tend to use to prepig with? I'm mobile so need something that doesn't need develop & drying if possible. Heard some people use mousse? I normal use colour touch to pre pig then dry and colour. Any suggestions?
Thanks in advance!!

Colour mousse is great for quickness but if it's going over hair that is bleached so light and you want to achieve a 6 or darker then don't expect it to last, it will fade real quick!