One of the most common techniques when building with plywood is to make a fillet. If you are building a boat it is an essential technique that you will have to master. The problem is getting the perfect tool for the job whilst your epoxy is in the pot curing. This set of six professional filleting tools are about 200 mm in length and cut with different radii which should cover most needs.
Snap the required fillet profile off the set of six, touch up the end with some fine sandpaper and you are ready to make the perfect fillets. If you clean them up with a rag they can be re-used many times.