CALLA Professional - Color Professional Base Gel Line (Dehydrator/Primer/Bond Base/Hard Base/Diamond Top Gel/Wood Tray)

CALLA's method of using their base gel is as follows: 

1. Dehydrator
2. Primer
3. Bond Base
4. Hard Base
5. Diamond Top

You can use it, but you can also use only the parts you need. 
If you are using a base, we recommend layering the hard base after applying the bond base on top of your natural nail.
(To prevent corrosion caused by acidic substances on natural nails)

If you use the Diamond Top, there is no yellowing. 
You will experience the best adhesion and shine.