I would like to widen Nulls comment to thread titles generally; I tend to ignore the 'I'd like this' type, so please threaders, make the thread title a bit more descriptive. Maybe I miss a few good threads this way, but with soooooo many threads coming up, my eye goes straight to the ones with interesting and informative titles. Maybe it is a habit born of filtering too much spam in my e-mails, but a thread title that is either ambiguous or essentially nonsensical just gets ignored. So, 'How do I simulate corrugated aluminium aircraft skins?' is far more likely to get a good response than 'I gotta problem'. Thanks! Tim PS How do you simulate corrugated aluminium aircraft skins?