I was told by Meguires that glaze is essentially polish and have used both, even together. However, I notice no difference with glaze and without. I was also told that neither is necessary unless your paint is in need of freshening (a layer of 'dead' paint taken off). So, until this is needed a thorough wax removing cleaning followed by a run with clay and then a waxing or sealing. As I understand it sealent is a harder polymer type that is more durable than wax for those that use automatic car washes, go longer between paint care sessions, or otherwise subject the paint to more harsh conditions. I myself wonder if there is any nutritional benefit to wax over sealent.