After you vigorously shake each cartridge, you'll want to be sure you twist & puncture each one into it's corresponding holder. Imagine, just like how you put on your vehicles gas cap.
View How to Insert Cartridges here: https://www.youtube.com/shorts/_33ngsuxsRM
Once the cartridge is punctured and the foundation is dispensed, both the cartridge and the foundation have a shelf life of 1 year. Be sure to use them within this timeframe for the best quality and performance!