Summarize the following:
Use sharp scissors to trim the cloth around the shape of the blank and make sure to leave about 2 inches (5 cm) of extra cloth draping over the board. Cut the cloth into "V" shapes where your board curves so you can fold it over the rails. You can buy fiberglass cloth at a surfboard supply shop, marine shop, or fiberglass shop. Resin and catalyst are the substances that when mixed together will create the clear, hard coating on the surfboard. Read the ratios for the specific product you have and mix them together in a small plastic container or bucket. Buy polyester surfboard resin and catalyst at a surfboard supply shop. Begin in the center of the board and use a squeegee to work the resin in a figure 8 pattern throughout the middle of the board. Work the resin out and over the rails to lock in the fiberglass when you reach the edges. Resin should take around 5 to 6 minutes to cool, so timing is important. Be sure the entire cloth is evenly wet and secure on the blank. Leave any excess cloth (it will eventually be covered), but make sure to squeegee away any excess drips. Add resin to the top side with the same method you used for the bottom. Add an extra 4 oz. (133 mL) layer of fiberglass cloth on the deck for added strength.
Cover the underside of the surfboard blank with 6 oz (168 g) of fiberglass cloth. Mix 24 oz (800 mL) of resin with catalyst. Pour the surfboard resin mix over the fiberglass cloth and spread it out evenly. Allow the resin to cure for about 1 day, then repeat on the other side.