I've used this cheap plastic 10" paint edge guide from Lowe's for both of my builds and haven't found a better tool for moving around resin while glassing, and to squeegee off excess resin. It's light weight, has a comfortable handle, and you can round the corners if you feel it necessary. A lot of my small fairing jobs are done with flexible bondo spreaders in widths up to about 6", but a rigid spreader works much better for working on larger areas that need to be as flat as possible, and this spreader works great for that purpose. Much nicer than working with a drywall knife, and I do a lot of drywall finishing, so I know from experience. Mike
Jacques, I actually gave that spreader to Jeff recently when picking up materials for my SK14. Small bondo spreaders work fine for small jobs, but the fact that they are very flexible makes them a poor choice for spreading fairing material on wide flat surfaces. This cheap spreader is the best tool I've found for that purpose.
I don't have any pictures, but I think everyone's seen those 24"x24" foam rubber mats with the puzzle joints, making them interlocking, and mostly used as a cushioned floor in kids play rooms etc. I cut these mats into whatever shape I need and use with sticky back sand paper. I use a lot of sticky back paper in 2 3/4" rolls, and 6" discs. One of my favorite hand sanding tools, especially for primer is to cut a 6" circle of foam and use it with the sticky back discs.