does anybody know where to get a stamp to mark polycarbonate with a certfication-mark...or a link to a manual how you can make your own stamp?

its a kind of waved symbol.

our tüv does not allow wind deflectors without any marking / approval-sign..

no, i do not wan to remove them for the test, as there will be taken pictures which will be kept as reference for the next test or if the police-officer stops you and complains about the missing mark.




[Edited on 22/1/16 by alfas]

Surely fraudulently marking them is as bad as being caught without? Less likely I guess.

You could make a mask via 3D printing or laser cutting and then grit-blast it on.

i do not know anybody with a 3D printer. how is it marked? by engraving or by heating a stamp or both ways?

[Edited on 23/1/16 by alfas]

You can use shapeways.com or protolabs.Co.UK. a mask should be pretty cheap. As for how they mark it officially - no idea. I'm guessing laser etch.