Thanks. The dots were sprayed with a "loose mask" (is that the correct word?!), means I took a paper, cut several dots in it and sprayed over it without touching the surface (but holding it close to the surface)

Yep, Im from Germany. From Saxony, to be more correct. And thats exactly the problem... Its a loooong distance to Darmstadt. But most probably one of our club mates will be there.

Im taking part in a German SciFi forum as well - and thats the top theme these days of course. We have a caertain member here thats taking part in both forum as well and - as far as I know - he goes there.