This is the model i’m having trouble with (top part): http://i.imgur.com/nhVMh1X.jpg
Using cycles and have 2 light sources in the scene.
How doth I do for removal of thee stripes on the model?
(sorry if I formatted this weirdly, i’m both new to blender and this forum so go easy on me 
Are you using a subsurf modifier and your model has triangles or ngons ? If so you will get artifacting if the triangles / ngons are not on a planar surface. Adjust your geometry to be made of quads that follow the surface shape of the object
Hi, there are some other methods to get it work.
Front is edge split modifier + bevel, back is for subsurf.
Cheers, mib
Thank you both very much 
