I have been doing hair for 15 years. When I started I did a lot foils all over and color in between and never had problem with foils slippin. I have been struggling lately doing a double process.I feel like a lot of the bleach now is designed for bayalage And made to melt and blend but not good to keep a foil to stick to the scalp with out slipping. I still have a large group of clients that are gray and want all over color with some foil I seem like I can only get a good out come if I do the service separate and not together which takes along time. Any advice ?