Preserve your paint with the Fresh-Port Paint Topper. Like coffee, paint is often oxygen sensitive, losing its freshness after breaking the seal allowing for oxidation. Over 75 Million Paint Cans are wasted every single year. Oxygen degradation is an issue of the past thanks to Planetary Design's patented Fresh-Port technology. Comes In A Pack Of Two. Buy Airgone Separately. To achieve the full effect of the Paint Topper, it must be paired with Airgone (aka argon gas). Airgone works with the paint topper to displace oxygen lingering in the bottle after opening. Argon is heavier than oxygen, allowing it to sink below the oxygen. Argon forms a protective barrier on the surface to prevent oxidation created by residual oxygen. Airgone does not impact the functionality of the product but preserves the freshness of your contents. Made of flexible silicone, the Paint Topper fits snugly around the mouth of the paint can creating an airtight seal. The magic is in the patented Fresh-Port and one-way umbrella valve which allows for the displacement of oxygen. With the help of Airgone, the Paint Topper displaces the oxygen resting on the surface of the paint, replacing it with argon, an inert, food-safe gas that prevents oxidation. Forget messing around with the traditional & messy paint lid, slip the paint topper on, apply a quick one-two second flush of Airgone through the Fresh-Port valve, and enjoy preserved paint again and again.