Fluid application device (1; 11; 21; 31; 41; 61; 71) comprising: - a reservoir for containing a free fluid (6; 16; 26; 36), and a fluid delivery device (2; 12); - the reservoir being closed by a valve (5; 15; 25; 35); - the fluid application device (1; 11; 21; 31; 41; 61; 71) comprising • tubular means (3; 13; 23; 33; 43; 53; 63; 73) for piercing the valve and simultaneously for setting the fluid in communication from the reservoir to the fluid delivery device; • means for relatively moving the valve toward the tubular piercing means (3; 13; 23; 33; 43; 53; 63; 73); said means for relatively moving the valve toward the tubular piercing means being operable by external forces applied to an actuator, as a result of which the tubular piercing means (3; 13; 23; 33; 43; 53; 63; 73) can release the fluid from the reservoir (6; 16; 26; 36) to the fluid delivery device (2; 12) each time the fluid application device is used; and • means for moving the valve away from the tubular piercing means in the absence of said external forces; characterized in that the valve comprises a material consisting of a mixture comprising one or more so-called self-repairing materials and one or more so-called non-self-repairing materials, where: - the so-called self-repairing material is selected from the group consisting of multifunctional fatty acids, acrylic monomers or polymers, polyurethanes, and copolymers based on polyethers; - the so-called non-self-repairing material is selected from the group consisting of elastomers, polyolefins, polymethacrylates, and styrenic polymers, or selected from the group consisting of polyethylene, polypropylene, polystyrene, polyamide, and polymethyl methacrylate; and - the mixture comprises from 40 to less than 100 wt.% of so-called self-repairing material relative to the total weight of the mixture, the remainder consisting of one or more non-self-repairing material(s). - a reservoir for containing a free fluid (6; 16; 26; 36), and a fluid delivery device (2; 12); - the reservoir being closed by a valve (5; 15; 25; 35); - the fluid application device (1; 11; 21; 31; 41; 61; 71) comprising • tubular means (3; 13; 23; 33; 43; 53; 63; 73) for piercing the valve and simultaneously for setting the fluid in communication from the reservoir to the fluid delivery device; • means for relatively moving the valve toward the tubular piercing means (3; 13; 23; 33; 43; 53; 63; 73); said means for relatively moving the valve toward the tubular piercing means being operable by external forces applied to an actuator, as a result of which the tubular piercing means (3; 13; 23; 33; 43; 53; 63; 73) can release the fluid from the reservoir (6; 16; 26; 36) to the fluid delivery device (2; 12) each time the fluid application device is used; and • means for moving the valve away from the tubular piercing means in the absence of said external forces; • tubular means (3; 13; 23; 33; 43; 53; 63; 73) for piercing the valve and simultaneously for setting the fluid in communication from the reservoir to the fluid delivery device; • means for relatively moving the valve toward the tubular piercing means (3; 13; 23; 33; 43; 53; 63; 73); said means for relatively moving the valve toward the tubular piercing means being operable by external forces applied to an actuator, as a result of which the tubular piercing means (3; 13; 23; 33; 43; 53; 63; 73) can release the fluid from the reservoir (6; 16; 26; 36) to the fluid delivery device (2; 12) each time the fluid application device is used; and • means for moving the valve away from the tubular piercing means in the absence of said external forces; - the so-called self-repairing material is selected from the group consisting of multifunctional fatty acids, acrylic monomers or polymers, polyurethanes, and copolymers based on polyethers; - the so-called non-self-repairing material is selected from the group consisting of elastomers, polyolefins, polymethacrylates, and styrenic polymers, or selected from the group consisting of polyethylene, polypropylene, polystyrene, polyamide, and polymethyl methacrylate; and - the mixture comprises from 40 to less than 100 wt.% of so-called self-repairing material relative to the total weight of the mixture, the remainder consisting of one or more non-self-repairing material(s).