Each sachet can be used on up to 4 clients when stored correctly. There are 10 sachets in a box so depending on your usage, you can perform up to 40 treatments per box.
Seal the sachet using micropore tape and place inside a ziplock bag. Good practice will be to write the date on the tape as oxidized solutions last up to 7 days for treatments and patch tests. Remember to massage the sachet before re-opening.
You can re-lift your clients lashes/brows after 48 hours if your lift has failed but remember to reduce your timing. If you have over processed the hairs, you should not re-lift as this will only cause more damage to the hairs. Your clients should apply castor oil daily.