Shellac is CND's soak-off system that sits between gel and lacquer: it is applied like polish, cured under a lamp and removed by soaking rather than drilling. CND sells it as a complete system, so the Shellac base coat and top coat are made to work with Shellac colour. Clients who like one system tend to stay with it, which is why many salons keep the base and top in multipacks.
This page holds the Shellac base coat and top coat in packs of 6 and 12 bottles. Base coat comes in 0.25 oz and 0.42 oz bottles, and the top coat packs use 0.25 oz bottles. Each listing title states the pack size and bottle size, so check it before you order. On the packs we checked, the price equals the single-bottle price multiplied by the number of bottles, so a pack is about convenience rather than a lower unit price. Each listing shows its own stock count.
The cure times printed on CND product pages differ by product and by lamp, so follow the instructions on the bottle for the lamp you use. Keep every layer thin: a thick layer cures unevenly, and that is where chipping and peeling usually start. Cap the free edge with base, colour and top so the edge is sealed. The top coat leaves a layer to wipe after curing, so finish with a wipe as the bottle directs.
Shellac is a soak-off product, so it comes off without drilling. Break the shine of the top coat, then soak the nails in acetone or use acetone wraps until the colour softens, and lift it away gently with an orangewood stick. Do not force or scrape the natural nail; if the colour is not moving, wrap it for a few more minutes. Finish the service with cuticle oil.