Aquatrols Capsil® F2A0046-000100 1 gal Spray Adjuvant 4 per Case. Waxy leaf surfaces can cause spray droplets to bead up, resulting in coverage gaps that can reduces the efficacy of foliar sprayed materials. CapSil® allows foliar directed sprays to spread evenly over the entire leaf surface, giving you full coverage with every application. CapSil ensures that you get the results you expect from foliar nutrients and pesticides without the added labor and expense of repeat treatments.