Material to patch wood siding

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.
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David Nebenzahl wrote:

Bondo works well.
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I would think fillers would separate due to different expansion/contraction rates. Redwood dutchman patch and Titebond II - should go pretty fast with a router and a jig.
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On 5/9/2008 5:30 AM Frank spake thus:

>

Yes, that would be the right way to do it, I suppose. (I used Titebond II to glue the plugs in.) I was trying to get away with just schmearing something in there, but maybe I'll rout it out and patch it that way.
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