A PT should always be followed by a DT.

The best way to determine if your hair needs protein is to do a stretch test. http://www.organiccolorsystems.com/t...-stretch-test/ But limp curls are a good sign that they need a boost of strength. Ignore the product recommendations on this link - just use the how-to info regarding the test/results.

For me, a PT consists of a RO conditioner with protein in it. I can easily overload on protein. For others, it is a recipe as in the link above or plain gelatin (which I think is addressed on the same link or another page at her site). There are also commercially prepared PTs such as joico k pak reconstructive.
remember, with all advice or suggestions for your hair, YMMV!!
My hair:
2b wavy, medium texture, low porosity, med-high density. Protein finicky.
My routine:
Cleansing: DCNP, every 4-5 days (occasionally use CJ cleansers).
RO: CJSC, occasionally use JCDC
Gel: KCCC, CJCIAB for 2nd day hair (sometimes third)

Heat is my friend: warm water rinses, steam caps, and diffuse dry. I love CLU cloths and my Denman.