UltraSeal XT plus hydrophobic pit and fissure sealant is a light-cured, radiopaque, fluoride-releasing composite sealant. It is stronger and more wear resistant because it is a 58%-filled resin and has less polymerization shrinkage. The spiral in the Inspiral Brush tip causes shear thinning of the filled, thixotropic resin, reducing its viscosity as it is placed. The resin firms up when shear thinning ceases and placement is complete, preventing the resin from running before it can be light cured. Using PrimaDry drying agent with UltraSeal XT plus sealant enhances penetration into pits and fissures by eliminating moisture that can cause failure in hydrophobic sealants. Shade Opaque white, 1.2ml syringe.