Sadly, the official CND Shellac service is an in-salon only treatment ... Gelish and OPI brands are both good, with a decent base coat and gloss top coat. Barry M also have a Gelly Hi-Shine ...

The key to achieving the ultimate shellac manicure is to follow CND's patented system, which involves using a specific shellac base coat, color coat, and topcoat that is cured with an LED lamp ...

especially if you have a particular CND shade in mind. Shellac is designed to allow oxygen between the layers of polish, meaning your nail plate can breathe even under two coats of cured colour.