The invention concerns a plaster system, in particular insect protection plaster system (10) to shield a building opening against insects, with a folded multi-fold, preferably horizontal stretching plaster fabric (12),a guide rail (14) to accommodate a peripheral area of the plywood (12) and a sliding bar (18) to detach and insert the plywood (12). For improved sliding guidance, it is proposed that the sliding bar (18) is stored in the guide rail over an end-sided cap (20) and that at least one sliding, flexible deformable slide piece (22) is used in the final cap (20).
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