Daz to 3DS Max integrating phoenix fd.

Hi all, I have exported an OBJ from Daz to Max (I have found fbx doesnt work very well). What I am trying to do is pour a phoenix fd liquid over the person model but when I try the liquid doesnt interact with the geomatry very well, its almost like theres a hidden resistance off the surface of the skin. When I repeat the process with a standard peice of geomatry it works fine?
Any advice would help.