t.akustik Contact Glue Liquid

I ordered these special adhesives together with the products dedicated to sound isolation for a small room. After drawing lines with the pencil on the walls to fix the products Diffusor Manhattan eps set, I found that the glue does not work, more precisely, after I cut the tip, instead of a special glue, a strange juice flowed. After looking for a warranty period written somewhere on the tube, all I found was a small print that had an expiration date almost 3 months ago (10.12.2020). As I ordered the products in Bucharest, Romania, a return for a few euros did not make sense. I wanted products that meet professional requirements. I don't know who's to blame, but it doesn't matter anyway. Be careful that the next time you order perishable products, they will be under warranty! Thanks.