With TCA, is frosting necessary for the chest area to be effective? Top of breasts to base of neck

I went to a local DR to have a TCA peel on my chest area. Ive been on these forums reading about TCA peels and frosting. Using 25% and 3 layers there was no frosting though. I was too scared to get another layer. I feel i may have wasted my money and will only end up resulting in a superficial peel. Is not frosting with that many layers a bad sign? Do you only frost on the face? Too nervous to go back if results will only be minimal.