Take your three layers of 1/4" plywood and glue the first two layers together. Once the glue is dry you can glue the third layer on. Dont forget to clamp your wood or if you don't have any clamps plie a bunch of heavy stuff on top.
Step 3: Design
Now you have to come up with a design for your longboard. You can copy other designs or make your own unique one. first draw your design on a large peice of paper and then trace that onto your wood. you can fold your paper in half and draw half the design and cut it out so you have a symmetrical shape.
Step 4: Cutting and Sanding
Now that you have your design on your wood you can cut it out. I used a jig saw to cut mine but you can use whatever works for you. sand it all nice and smooth so there is no rough edges. when this step is finished you have the start of your longboard deck.
Step 5: Fiberglassing
Now it's time to fiberglss the bottem. take your fiberglass matting and place it on the bottem of your long board deck. mix the resin according to the instructions that came with it. Apply the resin on top of the fiberglass matting and let is dry according to the instructions.
Step 6: Sanding Again
Sand the excess fiberglass matting off once the resin is dry and any rough spots you dont want.
Step 7: Paint and Grip Tape
If you want you can paint your longboard or draw a cool design on it. then you can put the grip tape on you can even make a design in the grip tape.
Step 8: Drilling Holes
Measure and mark the holes for the trucksand then drill them. Use the trucks as a template.