Surfing School - Glassing - Fins

Fins are fairly easy to sand once you get the hang of it. The following procedure is for a non-presanded fin blank, and should be modified if the fin is already shaped and only needs outer sanding. Place the board on edge with the tail section moved back from the stand. Using steady strokes and a hard foam pad, start at the base of the fin and run to its tip. Continue working from the thinnest edge to the back and then one pass along its back (rake) to take off the roughness and form the fin to its midpoint if not pre-shaped. Repeat the process on the other side of the fin.

If the fin is pre-shaped, there will be an other covering of cloth over the entire fin. In this case, not many passes will be necessary since you are only trying to smooth the surface area of the fin.