Chemicals that have an instant chemical reaction upon being dispensed are normally mixed as the product is being applied.
Epoxy, acrylate and polyester bonding agents fall into this category. They are applied through special applicators that allow components to mix whilst being dispensed.
Most gunned resin injection adhesives are dispensed via a nozzle having a helix mixing element that mixes adhesive and filler as the resin is extruded. Additionally Twistfix supplies an array of crack injection resins and colour-match mortars for repairing and filling cracked brickwork and stonework