Beuni Max Bond is medically tested skin safe and will give at least four weeks of hold. However, depending on climate, humidity, and body oils, it can last up to six weeks. It works well on all types of units. Tested against the best silicone competition out there, our new Max Bond shined. It became clear, very quickly, that Max Bond is a winner. Systems: All Base: Silicone Based Gentleness: Skin safe Hold: 4+ Weeks Clear when dry Waterproof Flammable FDA Approved Comparable: No-Tape & Extreme Hold