Epoxy Repair or A Dutchman Repair?

Splicing in a piece of wood can be done quite easily (see photo below). Using wood to replace rotten wood is clearly the best choice. Epoxy repair products may appear to be fast and easy but such a repair has a very short life. A repair should last for 50 years or longer and be easy to maintain. The only way you get a long lasting repair is to replace decayed wood with new wood.

Use exterior wood glue. Use the organic linseed oil glazing/putty to fill small cracks and paint this right away with the linseed oil paint. Using the organic boiled linseed oil and the organic linseed oil paint will make it simple and inexpensive to maintain for 50 or 100 years. The savings over time is enormous.