Surfers Textbook

Section 13- THE CONSTRUCTION PROCESS—CUTTING AND POLISHING

( This section contains more pages. Purchase " The Surfers Textbook" now to gain access to the full 416 pages)

Firstly, the cutting process involves the use of wet and/or dry rubbing abrasive paper to remove any irregularities in the finish resined surface. Depending on how well the resin is applied and the environment it was carried out in, will determine how much rubbing back will be needed. Resin pooling, brush strokes, hairs and dust particles will need to be sanded out. Generally, it will be necessary to start the wet or dry rubbing process with 180 grit aluminium oxide or equivalent, with a poorer surface needing a coarser grit, working up to 1200 grit to achieve a relatively scratch-free result. Due to the relatively thin finish coat, excessive abrasion or too coarse a paper will quickly remove the finish coat and expose the glass fibre cloth, necessitating a repair to be carried out. A random orbit sander can be used when suitable abrasive pads are available, however it will be necessary to finish the finer grades by hand as it involves using water as a lubricant.

After wet rubbing with 1200 grit along the length of the board (to have the fine scratches running the same way), a polishing compound specifically designed for glass fibre reinforced plastics can be applied with a high speed polishing machine having a foam pad. A very small amount of water is used as a lubricant.

The surface can then be buffed to a mirror–like finish with a lamb’s wool pad. It is recommended to leave the finished surfcraft 7–10 days to allow the resin to harden or cure fully so as to avoid excessive indentations when it is used.