Building a Fiberglass EnclosureI am in high school, and am posting this for a project. Hope it can help and please reply with any questions.1.) First off, you must decide where you would like your subwoofers. I choose right behind the back seats in my Mitsubishi Montero Sport. To protect your car, use masking tape and aluminium foil, and cover anywhere where fiberglass resin might hit (this is a real problem if fiberglass resin touches your carpet as the resin will harden on the carpet and ruin that spot. Make sure that there are no foil on foil seams that will allow resin to penetrate).2.) To protect hands from resin put on latex gloves. Next you must tear up the fiberglass mat into workable pieces. Mix the fiberglass resin and hardener in a bucket (an old milk jug with top cut off works well). Most resins require around 14 drops of hardener per ounce of resin, but check packaging to make sure. Apply the resin with a paint brush or roller first, then put some mat on top and roll on more resin on top. Only put the mixture and mat where the enclosure will be touching the car.3.) Once dried, remove enclosure and peel off aluminium foil and masking tape. Cut the edges of the piece where you don't want the enclosure to go out to.4.) Next you must cut out rings out of mdf wood. Trace the outside of the subwoofer that you are using onto the mdf. After measure distance from outside of subwoofer to the inside of that top lip that has the holes for screws to hold the speaker in place. Trace that distance onto the board on the inside of the outer circle. Use a drill to make a hole on the inside of the inner circle and then a jig-saw to cut out the inside, and then cut out the outside of the ring.5.) Use wooden dowels to support the ring where you will want the subwoofer to be placed. Glue the dowels in place with hot glue. I used another piece of wood to later put the amplifier on (optional).6.) Cover the top of the enclosure with a cloth and use hot glue to hold it in place. This will provide a surface to put resin onto.7.) Fiberglass over cloth using steps from before. Make sure to put a few coats on. If the glass is too thin, the enclosure will rattle.8.) Sand the enclosure. If there are any dips or knicks that need to be filled, use bondo and a putty knife to fill them. The bondo mixture will be much thicker than fiberglass resin but are alike in that you have to mix resin and hardener. Follow instructions on packaging.9.) Allow bondo to dry. Sand. Repeat if necessary. Paint
