Can't believe this has gone so tits up!
I've PM'ed Marti who received his spoiler direct and he has had problems with the finishing, and also a twist in the spoiler.
I've also tried to contact Silex840 in the US who also received his direct but fully finished, to see how his was, but no reply as yet.
The original one first made and fitted by Nico to his car appeared to be perfect, but this second batch not so.
Maybe the manufacturer has a special way of finishing them with a high build varnish, I don't know?
There was mention that one of the spoilers had to be remade, maybe Marti was unfortunate to receive this one that has a twist and our batch are straight?
It's a shame that Nico has gone quiet.
As it appears to be a varnish issue a discussion with the manufacturer who varnished his and Silex840 may sort this out "oh use xzy varnish made by abc" ...we can hope!