Patch testing has changed so much over the past few years, we used to get taught to blob the glue behind the ear or on the wrist, We now know that this way of patch testing (even though sometimes trainers still encourage to do this).
Lash glue is not meant for the skin. The main ingredient is an irritant for skin, eyeballs and respiratory functions. It can really irritate the skin as it dries and causes the skin to go red, which will show a false reaction. It is not a good technique of testing because the fumes from the glue being around the eyes will usually give a reaction.
The most well known way to patch test is by booking a 15 minute slot, putting eye pads on a client, use your usual priming products and apply a few single lashes per eye. 5 very natural lashes per eye, apply them very fine so the client wont notice them. When that client comes in for the full set and they are still in remove them as you go along. This technique is very thorough but it does take time, and booking patch tests in the system is hard to find time,
It is important to know before you decide how you will be patch testing you will need to contact your insurance to see if they have their own requirements When it comes to lash day there is still a chance that a client could develop and allergy. We can only do so much when it comes to patch testing and sometimes a few minutes of exposure to the glue vapours is nothing compared to the 2+ hours of glue exposure in a full set.
Sadly we have done all we can but there is going to be that 1% that is allergic and it may be that the allergy is not noticed until sometimes 12-48 hours after the lashes have been applied. But would you feel better knowing you tried to patch test rather than going straight in without one? What if your client was coming in for her lashes a few days before her wedding?
In 2018 Lashbase were the first company to come out and completely change their patch testing guidelines. They argued that the above tests aren't always clear. and reactions usually happen after having lashes on so why bother? So people saw it as a very clever marketing play. 'Buy our glue because you wont have to patch test' a few companies then hopped on the bandwagon.
I personally will always patch test. If it all goes pear shaped and a legal case hits you, you're going to feel better knowing you attempted a patch test.
Things to take away from this is never patch test on skin, check your manufacturer guidelines and most importantly also check what you're insurer advises,