I have this experience with 2nd day hair too. Some days it's awesome, some days it's just mediocre. It's so weird lol. I do the exact same things. I think it has to do with the weather and how my hair turns out on the first day.

3a/b low to normal porosity curls
CG method since 2006 @:-)
CO wash: suave naturals coconut
rinse out CO: GVP conditioning balm
stylers: KCNT, CK, jessicurl spiralicious
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Blog: Curls and Blossoms