Many products use the same ingredients and it is one or more ingredients that you are reacting too. Most probably, the cause is the ingredient HEMA, which is the #1 nail product allergen in the UK. HEMA is also a cross sensitiser. This means if you get an allergy to HEMA, it then encourages allergies to other ingredients - especially an ingredient called Hydroxypropyl Methacrylate (HPMA) that is used in some gels, gel polishes, but also in HEMA-free acrylic monomer!
Because of this cross sensitivity, it is a common BIG mistake for NT to change brands without understanding what they are doing, because new allergies will almost always occur.
The correct procedure is to stop using nail products, visit a dermatologist who'll make a Patch Test. This will show which ingredients you react to. Armed with this info, THEN you look for products that don't contain these.
Obviously, this is impractical. NT don't want to wait up to 2 years for an appointment and have no income. Then one option is to choose product that don't contain ANY of the most common nail product allergens - these would include all the ingredients you are tested for in the Patch Test. These are so-called hypoallergenic products.
There are very few hypoallergenic products available. They are extremely difficult to develop because you can't use the higher risk ingredients that actually make application easier and provide high adhesion so they have very long wear.
But the other point which is very important, is to find out how the allergy happened. Allergies can only occur if there is longterm, repeated skin contact with uncured or under cured products. i.e. the NT has not worked cleanly. They can also happen if the acrylic mix ration is too wet, or if they use a UV lamp not properly matched to the brands products. This can cause under cured dust after filing, and some of this is so small that it can float in the air and land on any exposed skin. This is why some NT develop rashes under the eyes or on their necks.
So it is mega important that all skin contact is avoided going forward. Otherwise, regardless of the product you use, there is a risk of more allergies.
Nitrile gloves are not designed to protect against nail product ingredients. The methacrylate chemicals will pass through the gloves quickly, so should be changed every 30 minutes (15 minutes if you have an allergy already). In addition to double gloving and changing often, you can use a skin barrier cream under the gloves and on arms that will create a barrier to chemicals. We like and sell "Gloves In A Bottle". You can also get this in Superdrug and it is not expensive - a small drop goes a long way. But don't use as they recommend. Instead reapply more often, like between each client.
If you have other questions, you are welcome to message me. Good luck!