The invention relates to a method for stabilizing a coating curtain, wherein a coating composition from a above a moving web (W) arranged Florstreichvorrichtung (11) as a, a coating curtain (2) forming flow arranged on a on a surface of the material web (W) String point ( 12) applizieret, and wherein a boundary layer of air (5) is derived prior to application of the coating agent with respect to a front side of the coating curtain (2), in the running direction of the web (W), at least one - is substantially parallel to the coating curtain extending - guide member (20) is positioned, distinctive to form a from the properties ago by a surrounding gas volume (39) and the coating curtain (2) adjacent, before the effects of the derivative of the boundary layer air is substantially protected, flowing gas zone (31), and wherein at least one in one slot (22) arranged between the guide element (20) and outlet means (6) of the boundary-layer air adjusting element (44, 45) and the guide element (20) can be adjusted around the slot (22) with respect to the shape and / or the adjust size.
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