Hello:

Have a wooden window sill that has a few inches x a few inches missing from
an outside corner.
Not rotted out, this area is totally gone. Probably rotted first, then just
broke off.

Hate to go to the expense of having a carpenter come in to replace the whole
sill.
Remember a few years back when we had one done, it was quite costly.

Was wondering if theres anything like "plastic wood" that would bond very
well to the raw edge that was created, and that I can perhaps file or grind
to the right shape after it sets up.

It would have to have a "mass" that would cover perhaps 4" x 4" x the
thickness of the sill.
Quite a "chunk," I guess.

Any thoughts on this would be most appreciated.

Thanks,
B.