Is it heat or sunshine/UV? Will it work on a hot cloudy day, or a cold sunny day? I know it works with a hair dryer - so it is just heat-activated?
How does Sun In and similar products work?
normally i only put it in during the summer on a warm sunny day when i can be outside a long time.so im guessing just heat activated
How does Sun In and similar products work?
That stuff is so bad for your hair!!!
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