Wow.
Talk about a relevant issue for me. I'm making a custpm Wookiee too and went for the double hinged knees too. I was actually here looking for tips pn how to paint a pelt.
Here's what I did. It's a slow, tedious multi-step process, but I love the end result.
I used greenstuff/kneadite to make hair. Smush on a 1-2 mm layer on the lower legs. Use a Xacto and pull grooves in a wavy downward pattern to simulate hair. Let that cure.
Next, flex the knee as much as possible, opening the joint. Put a thin layer of an easily removable material into the joint space below the knee, but not ON the knee. I used yellow mold making material. Make the layer as thin as possible and let it cure completely.
Take a small amount of greenstuff and put it on the knee. Press it onto the entire knee surface. Use the Xacto and pull grooves down over the removable material until it reaches the upper part on the lower leg. Overlapping it a fraction of a millimeter is even better. Let that cure completely.
Remove the removable stuff. Open and close the knee joint. You'll see that the thin greenstuff on the knee glides over the greenstuff on the lower leg when the leg is extended, yet covers the unsightly joint almost seamlessly when the knee is flexed. The only problem might be that the greenstuff might pop off the knee plastic. Just preemptively pop it off and superglue it in place.
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Repeat the process with the lower part of the upper leg. Flex the knee. Apply removable stuff ro the joint above the knee and let it cure. Place a small amount of greenstuff above the joint and pull grooves down with the Xacto blade until it just reaches the tuft of hair on knees. Let that cure and remove the removable stuff.
I should be posting my Wookiee in a couple of days.
She's absolutely gorgeous.
Dance Chewie.
Dance.
Cant wait to see yours.
Thanks