Need hard drying expanding foam (epoxy?) to solidify bases of 10-12 5X6 pine support posts on porches

[mattkime]

Photos would help. Its unclear to me why you wouldn't simply cut well above the rotted portion and remove the rest.

It would also be good to make sure the appropriate footing is used as it could significantly extend the life of your work.

Wood hardener aims to prevent rot from spreading.