A method for manufacturing a filled cavity between a first surface and a second surface. The steps of the method include: providing a first surface and a second surface; applying on the first surface and/or the second surface a filling material that has a carrier fluid and necking particles; providing spacer elements for defining a width of a cavity between the first and second surfaces; bringing the first and second surfaces together to deform the filling material such that at least one spacer element is held between the first and second surfaces; and removing the carrier fluid such that necking particles attach in a contact region of at least one spacer element with the first surface or the second surface to form necks.