Acid-free fibreglass gels with very high adhesion properties. Due to the fibreglass fibres contained in the gel, optimum durability is ensured even for problem nails (e.g. cracked nails). The fibres become completely transparent after curing and are therefore no longer visible. Of medium viscosity, glossy, without warming, and without yellowing. The gel can be effortlessly filed into shape, with a minimum amount of file dust.