Eyelash Extension glue and/or supplies are plenty.  There are no differences between eyelash extensions products and i.e. hair care products on the the market professional and/or retail.  Each product line will say they have the best on the market.  As a consumers we try the different products until we find the one/s that deliver the desired results.  Eyelash extensions supplies are the same hit and miss until you find what works for you and your clients.  I have been an licensed esthetician since 1987.  When I first was introduced to the newest wave to hit our market I spent a lot of money and did the research to find the products.  I continue to stay in the loop of the changes.  There should be no pain involved in any part of the eyelash extension application.  Using a glue that has a very visible white edge forming as it dries on the jade stone in not recommend; the result is usually brittle lashes to the touch after the glue has cured.  Clients don't usually like the feeling of brittle lashes.

I hope that this information has been helpful.