A production method for a poster device with two boards and a frame as well as a poster device. One permanently fixed board is attached to the frame. The other board is removable and can be removed without tools. The frame may be a snap frame and the removable board may be held by snapping elements of the snap frame. The removable board can be removed after the snapping elements have been opened. The method comprises the following steps: ⋅providing a frame and a permanently fixed board comprising a frame-like groove, ⋅placing the frame and the permanently fixed board horizontally, ⋅pouring a flowable gasket material into the frame-like groove so that the groove is completely filled with the flowable gasket material and the flowable gasket material sticks out from the groove, ⋅solidifying the gasket material in such a way that it will not solidify for at least minutes, preferably for at least 20 minutes, ⋅placing the removable board onto the solidified gasket material, ⋅fixing the removable board. The internal space of the resulting poster device is moisture tight.