That must be water soluable because one of the curlmart items lists it in the ingredients ( one I use and get no buildup from) and beside it it says water soluable.
This one said peg-40 after it
2c/3a?
Low porosity, medium texture.
http://public.fotki.com/Medusahair/

If it smells good put it in your hair, if it tastes good spit it out!