Just plugged a couple holes in a client's house that were drilled by a perhaps overzealous plumber installing an external tankless water heater; they left two big holes in the siding. Plugged them nicely with conical wooden plugs, but of course there was some tear-out, so there are some rather large divots that need to be filled.
With what is the question: what material should I use to fill these gaps that won't easily come out? The siding is old redwood, in a mild (N. California Bay Area) climate. Some of the divots are about 1/4" deep. Wood filler comes to mind, but I don't think that would last very long.