I once found a guy who was a miracle worker. Replaced several panels on my learther seats for next to nothing ($300). Beautiful job. Anyway, I asked him about the two cracks in my dash, and he said he could fill them in but they would come back in time and after the sun had hit them.

My recommendation: Get a dash cover. I had one on my 380SL, and unless you knew it was a cover, you'd swear it was the original dash. The covers are relatively cheap. Here's a link, in case you're interested: http://www.coverlaymfg.com/E_Store/Dash_Covers/Foreign/Mercedes/