Many years back, when it was first introduced, Saunders would refer to a “bathtub test” in which they took a tub of water and several arrows fletched with NPV and competitors adhesives and see how the others fletching came loose. Today NPV is still considered the best and most advanced nock and vane cement in the archery industry.  Saunders NPV™ Arrow Mate Cement, an all purpose adhesive for household and shop use, works well in damp or freezing conditions. 1 oz Tube