A 2 bottle adhesive with a multimode primer makes a lot of sense to us. This has been our 'go to' two bottle system for over 5 years. Single-bottle universals co-formulate hydrophilic and hydrophobic components — a compromise that degrades bond durability over time as water uptake increases in the set adhesive layer. G2-BOND separates them deliberately: the 1-Primer is hydrophilic and penetrates dentine effectively; the 2-Bond is genuinely hydrophobic and seals over it, producing a 35µm bonding layer that resists hydrolytic breakdown. That thicker layer also acts as a stress buffer in high C-factor posterior cavities — particularly useful under bulk-fill composites. HEMA-free throughout, which removes the main driver of long-term bond discolouration and is increasingly helpful for allergies.