The epoxy product that I have used (Abatron) is worth the extra if for no other reason that it sands more like the wood, whereas Bondo is much harder than the wood and will tend to stand proud of the surrounding areas if you’re not careful when sanding. I’m not familiar with the P.C. product to which you refer, but would never mix products that use different solvents.
This house west of downtown Austin, Texas, has floor-to-ceiling glass with no window treatments but uses the topography as a privacy screen.
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