I've just been doing a search here on polyquats and I think I have found what gives me second day hair -- and that would be polyquaternium-4. I've read that it can build up but I don't mind using a sulfate shampoo or my detoxifier from Aveda once a week or so.
I either use the product with the polyquat or I don't get second day hair.
Natural hair color - dark brunette
Fine, thinish hair/3a, 3b
Wow, that's a very interesting observation, I've seen that pq in quite a few mousses, it's in the "Aussome Volume" one I just got from K-mart, will have to try it soon to see if that works for me too! I have been totally oblivious about pq buildup, wouldn't know what it feels or looks like but maybe I've never had any (or much?) since I've been on a restless product rotation for over 2 years now... I honestly would be much happier with just 2-3 good products like before but in my case buying cheap stuff for my hair is a psychological outlet...
2A/3A, medium length, layered, colored dark/medium ash blonde - "CGer" since April '02.
"Converting the 'curlskeptics' one curly head at a time..." HWHC