Posters provide you with inexpensive art for decorating a large blank wall. Mounting or framing the posters gives them a finished look and prevents the edges of the poster from fraying or becoming damaged. Posters are sometimes expensive or difficult to frame if they are very large or odd sized. Cheap mounting options that don't wreck the poster are available if you look beyond the traditional frame.
The least expensive method for mounting a poster is one of the simplest to do yourself. Foam core boards are made of foam with a paper covering on either side. The foam comes in a variety of thicknesses. Archival, acid-free foam core is also available at a greater cost. Cut the foamboard to the size of your poster using a sharp craft or utility knife. Attach the poster using a spray mount adhesive, taking care to smooth the poster on slowly to avoid air bubbles.
Simple matting works well to frame a poster on its own, or you can use matting in conjunction with a traditional frame. Matting boards come in a variety of colors. Most are acid free or low acid, so they don't damage your posters. Archival-quality boards cost more but they provide the most protection for posters. Purchase precut mats to fit a standard-size poster. Frame shops will cut mats to fit odd-size posters for minimal cost. If you aren't using a frame, the mat requires a backing board so you can sandwich the poster between the backing and the cut mat board.
Custom framing is the priciest but most professional-looking choice for large posters. A cheaper option is using premade poster frames. These frames come in wood, plastic or metal. The less expensive types feature plastic instead of glass. You can also create your own custom frames using inexpensive wood molding. Miter the corners of the wood to create the corners and glue the frame together using wood glue. Use thin cardboard or plywood to create the frame backing. Glass isn't necessary, but you can purchase glass from a frame store if you prefer to use it when framing your poster.
Wood mounting provides a sophisticated but low cost option for displaying your posters. Paint or stain a sheet of plywood that is slightly larger than your poster. Mount the poster on the wood using a spray mount adhesive. Using wood larger than the poster provides a frame effect. Wood is not acid-free, but you can paint it with acid-free paint. The paint provides a protective barrier between the poster and the wood. You must also use an acid-free mounting adhesive to prevent the paper from discoloring.