Porosity Control by Roux

Okay, I've been researching Porosity Control and I've read that it is crucial for hair because it closes down the cuticle so our hair can hold in moisture better and return our hair to it's normal pH level. (If you go to LHCF and do a search for Porosity COntrol, a bunch of informative threads will pop up for anyone else who is interested.) Many girls on the site had a problem with dry hair, snapping ends, and not holding moisture. This product is suppose to held tremendously will all three. I went to Sally's and bought a trial size bottle ( 1.6 oz. for 1.89). Here is what it says:

Porosity Control Corrector & Conditioner: (pH 4.5)

Use before a chemical service to prevent chemical shock, to equalize hair porosity.

Directions: Apply to damp hair before a chemical service. Leave in hair for 30 seconds then rinse. Perform the chemical service (color, perm, relax, bleach). Can be used after a chemical service when additional conditioning is required.

Ingredients: water, propylene glycol, dicetyldimonium chloride, oleyl betaine, lecithin, guar hydroxypropyltrimonium chloride, DMDM hydantoin, fragrance, lactic acid, titanium doixide, mica, methylparaben,propylparaben, violet 2, green 5

My question is with the directions. I don't see how you can apply this to damp hair  and right after relax it. Has anyone used this after a relaxer or other chemical service. Everyone on the LHCF seemed to rave about it.