building door panels

im trying to build my door panels from the stock ones im using fleece but im wondering if it would be enough just using the fleece then the bondo and then painting or should i use fiberglass before the bondo?? plz help out here thanks

Just to clarify...are you recovering the current door panels? (using them as your structure) or using them as a template to form your own door panels?...

typically fiberglass resin on its own is very week and brittle, and would probably crack the first time you closed your door. Though mixed with fiberglass matting it becomes extremely rigid and strong. The more layers the stronger the panel.

yeah im gonna be using them as my structure thats why im asking if i need fg mat