I suffered damage from a nasty peroxide mishap recently, so that some of my hair became highly porous, in the way you describe.

Here's what worked for me: After using a clarifying shampoo (like Suave clar ... ), I followed up with an ACV rinse to close the cuticles.

Next: I did a protein treatment (I use "JOICO K-pak"). Keratin protein can help give your hair back the elasticity it lost when your hair cuticle was damaged, and that can lead to revived curls. Plus keratin fills in the damaged areas of the cuticle so the hair is smoother, stronger and better defined. OK ... Then the rinse out, followed by a DC to moisturize the hair (I use Heaven In Hair conditioner by DevaCurl). Left that on for 1 hr. and rinsed. You may have to repeat this process for the next few times you go to wash your hair.
Originally Posted by Korkscrew
I'm finding the advice on this thread really useful. If you were repeating the process the next few times - would you still do the clarifying each time, and the ACV?
UK based wavy

Mostly waves, but curls and straight bits too!
Fine to medium, high porosity, medium density, very low elasticity
Highlights damage (growing it out), seems to like protein and need lots of moisture.

Cleanse - CJDF, trying out low poos ; Co wash- Uk chemist brands, Urtekram Rose or Aloe, Hairveda Amala Cream Rinse; RO - varies, Tigi Moisture Maniac, Desert Essence Coconut ; Leave in - Keracare natural textures; Sealant - argan oil
Trying out new things, still looking.