The present invention relates to a spraying device 20 for mixtures obtained from the reaction of polymer materials. The spraying device 20 comprises: a casing 22, which encloses at least one mixing chamber 24 and which is provided at one of its ends with a nozzle 26; a mixer 28, which extends at least partially inside the mixing chamber 24 along a longitudinal axis X of the mixing chamber 24 and which is designed to rotate about said longitudinal axis X. The mixer 28 is intended to mix together at least two reactive polymer components introduced inside the mixing chamber 24 so as to obtain a polymer mixture which is designed to be sprayed through the nozzle 26 in the form of a spray cone Z. In accordance with the invention the mixer 28 is provided with an appendix 30 which protrudes, at least partially, from the casing 22 through the nozzle 26. The appendix 30 is provided with a deviation surface 32, on the outside of the nozzle 26, which is inclined at an angle of deviation a relative to the longitudinal axis X and which is intended to intercept and deviate at least a first portion K of the spray cone Z sprayed through the nozzle 26.