Paradise ponders, special request gluey liverwurst edition... Because one of you just had to ask, here's the redwood sanding dust and glue filler material I've been using. The first photo shows a nifty blue silicone glue dish I picked up a few weeks ago, with a pile of redwood “flour” and a blob of Titebond III glue. The second photo shows the stuff after mixing with a putty knife. It's got roughly the color and texture of liverwurst, though it smells much better. :) I mix it fairly thick so that I can press it into cracks with the putty knife, then scrape it level with the same knife.
Once you mix it up you've got about 10 minutes of working time. Cleanup is crazy easy: just scrape the excess you can easily extract into a trash can, then wash it up under warm water. It could hardly be any easier than that! Once it hardens for 24 hours, the stuff is easy to sand and paint. One lesson I've learned: you'll want to press it into the cracks as hard as you possibly can with the putty knife, so that the paste infiltrates the rough sides of the crack. Adherence is much better that way...