Refinishing a hardwood door

I am currently refinishing a hardwood front entry door; oak, I think.
I have just about completely removed the old poly and stain by sanding. However, in a few areas, the surface wood is just a tiny bit softer and more fibrous. I assume this is due to some moisture penetration under the old poly.
These areas are still pretty solid -- can't dent with a thumbnail. But I can see and feel a subtle difference when sanding them -- the dust is courser, softer and more fibrous. In the sounder areas the dust is fine, dry and powdery.
What can I do with these areas prior to painting with fresh (oil based) poly? I don't think sanding all of the slightly soft material away is going to be practical.
I have seen various "wood hardener" products in the big box stores but have never used them. Are they appropriate here and do they work? Some other treatment?
FWIW, this door is fairly well sheltered under a deep entry porch. I am not planning to apply any stain.
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I would consider using a thinned epoxy to seal the soft areas. You can buy special boat-buidling expoxies and get a thin mixture, or you can thin hardware-store "five-minute" epoxies with denatured alcohol (I think-- I haven't done this in a while, so I may be remembering wrong on the thinner)...I don't think the epoxy will affect the color once you've put on an oil-based poly...
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