Unwrap the mystery of upholstery, and stitch together ... Glue the batting to foam with a spray such as 3M Headliner & Fabric Adhesive ($19). When youre making more than one of anything, a pattern ...

When the headliner is exposed to excessive moisture and heat, the fabric can warp and the adhesive keeping it ... the headliner (and any other delicate upholstery in your car, for that matter).