What body panel is it? I just went through this 3 weeks ago on a new car I bought. I told them I would not accept a respray and would only be happy if they swapped the bumper cover with another unit they had.
When I first got one I had poor results too, I was using car wash soap as a lube. I then mixed up some ONR as lube and it worked like it was supposed to.
3D might be having a issue with their manufacturer. On 12-21 Ray(from the other site) told me 3D told him 2 weeks and looking at another online retailer they are about to run out too.