Resin-based dual-cure E.T.C. is reliably strong and incredibly simple. All you have to do is express E.T.C. from the automix syringe right into the crown and seat it. If you’re using Parkell’s Brush&Bond to protect the prep from sensitivity and recurring caries, just apply a thin layer of lubricant (e.g., Vaseline or K-Y Jelly) to the majority of the coronal portion of your crown prep before you use E.T.C. cement. The lubricant will prevent the cement from permanently bonding to the Brush&Bond, but will also provide a retentive, leak-proof collar around the margins.