MDT NanoGuard CLP-X - 13.5 US FL OZ Spray Can The MDT Nanoguard Gun Protector is the second step in their three-part maintenance lineup, designed to protect your firearm from rust, wear, and the elements over time. Leveraging tungsten disulfide nanoparticles-originally developed to reduce friction in heavy mining cables-this formula bonds to metal and polymer surfaces, forming a long-lasting, hydrophobic layer. It locks out moisture, reduces friction, and holds up in extreme temps and storage conditions. Whether you're storing your rifle for a season or just finished a long match, this is the layer that locks in readiness.