Can I use a bonding agent before use of self-adhesive cement such as 3M ESPE RelyX Unicem 2 Auto-Mix Self-Adhesive Universal Resin Cement?

No, this technique is not recommended. Although bonding agents may be compatible with 3M ESPE RelyX Unicem 2 Auto-Mix Self-Adhesive Universal Resin Cement (3M ESPE), their use makes the technique more complicated and does not dramatically improve bond strength.