PLEASE HELP!!! Can't fix the surface mistake

#1

I built neon tube using Paint Effect brush and changing its shader.
Now I have NURBS surface that intersecting itself in some places. I literally have no idea what to do and hope that some kind people can help me with my problem.

P. S.: I’m attaching screenshots below.
http://i.imgur.com/KLXu4Ik.jpg
http://i.imgur.com/oa4eDju.jpg
http://i.imgur.com/hILkwIn.jpg

#2

convert your paint effect to poly and “average vertices” where you need or use the sculpt brush to smooth the mesh.