My mom talked me into cutting some cedar boards up for her to use as interior trim panels despite my best efforts to talk her out of it. These have some pretty large (2"x1/4" or so) voids and a few knots with chunks out of them or small cracks. Trying to make the best of a complicated situation I'm looking at something I can use to fill the voids somewhat and stabilize the knots.

My best shot so far is West System 3 with either some sawdust and/or a little dye and some 403 filler added, but wanted to plumb the collective wisdom to see if anyone had a better idea. Its western red and is fairly mixed red/brown, the knots darken up quite a bit with any finish (quite pretty and wide boards, just a lot of "character").

I believe that she's going to use either a wiping varnish or poly on top.

Thanks.