Builders of classic kits are served by ship paint masks at 1:400. The shelf covers deck masking for the battleship USS Missouri, cut for one specific kit release. The masking sheet shields the planked deck while you spray the non-slip areas, giving a sharp colour boundary without the hours of tape work the job would otherwise take.
1:400 sits on the border between the large and the collector scales, and deck masking suits it as well as it does bigger hulls; the stencil also spares you dozens of tape strips around anchor fairleads and deck fittings. Confirm that your box matches the release named on the mask. Matching kits are in 1:400 and 1:450 ship model kits, and stencils in other sizes, 1:350 and 1:700 included, are at ship paint masks.