Don't shell out cash for an entire can of microfibers when you only need a handful. Mentioned in the build video series, these microfibers are a huge help when building many parts of the foil. When added to epoxy or polyester resin the fibers thicken things up so you can use it to fill in the gaps at many of the joints. Also mentioned in the video, the thickened epoxy makes glueing on the wings an easy job. Quality, strength, and smooth curves can be expected with the help of micro fibers.