(TrendHunter.com) e.l.f. Cosmetics recently launched a solid gel cooling primer stick that is sure to appeal to cconsumers looking for a reprieve during the summer months. The Stay Cool Primer Stick by e.l.f….(TrendHunter.com) e.l.f. Cosmetics recently launched a solid gel cooling primer stick that is sure to appeal to cconsumers looking for a reprieve during the summer months. The Stay Cool Primer Stick by e.l.f….