A process for the preparation of coated sodium percarbonate containing particles, comprising (a) a manufacturing step of sodium percarbonate containing core particles, comprising the crystallisation of sodium percarbonate from aqueous solution and the separation from aqueous solution, (b) an at least partial drying step of the sodium percarbonate containing core particles, (c) a coating step comprising the application of a base coating on the so obtained core particles with one or more sodium percarbonate containing or generating solutions and/or suspensions, and optionally one or more additives, and (d) a drying step of the coated sodium percarbonate containing particles, wherein step (c) and/or (d), and optionally (b), are carried out in a fluid bed reactor and the global molar ratio between hydrogen peroxide and sodium carbonate in the sodium percarbonate containing or generating solutions and suspensions is below 1,35 or above 1,65.