and base material containing calcium hydroxide

and calcium hydroxyapatite in a urethane dimethacrylate base

It is a highly filled resin (for a liner) with minimal shrinkage and water absorption. 

Prime-Blend Ultra has a higher viscosity than conventional liners,

eliminating the need for a ball-type applicator.

It's superior strength and water insolubility make

Prime-Blend Ultra the material of choice under composite,
amalgams and gold 

Prime-Blend Ultra is easily contoured with a high and low speed hand pieces.

No more instruments-to-pad-to-mouth delivery.

No more contamination of cavo-surface margin upon entry into cavity preparation.