How To Make A Fiberglass Mold With Cardboard. A plug is the original item that the fiberglass mold will be taken from. Allow that coat to cure for up to 24 hours.
Allow the resin coat to cure for between six and 24 hours. Allow the tooling coat to cure to a soft solid;
Allow this to dry and next step will be the fiberglass matting and resin. Apply a layer of resin on the mat and then press on another mat.