A fillet is a rounded layer of putty made from thickened resin that is placed in the inside corners of the seams instead of a chine log -- a long trapezoidal stringer of wood, which is very hard to cut and bend. Plus a fillet is a lot cleaner and easier to sweep out.
My mixture is about half and half microspheres and talc. Microspheres are small glass bubbles that are used to add tiny air spaces to the resinto make it lighter. Talc is just an inert thickener, but straight talc can add a lot of weight.
We just cut a small piece of plywood to a 1 1/2" radius or so and use it to screed the putty to shape. It's a messy job, but if you are careful and clean up the edges prior to curing, there will be much less sanding later.
After the putty cures, cover it, and another inch beyond on each side with tape. In the above pic the tape is placed and still dry prior to wetting out with resin.
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