Should I worry about stress marks on the plastic? I just noticed some appeared on the hands of RTS Wreck-Gar (the one that gets to hold the ax).
It depends... Are you constantly fiddling with it? If you are, then it may be an issue, but if you leave the stressed plastic alone - like most high pressure points - then you should be fine. I don't mess with my Wreck-Gar or e-Hobby Scrapheap. I just have them on display. Wreck-Gar is holding his axe, but I've left it in since I first transformed him straight out of the box 2 or 3 months ago.
I have a little stress or alot of stress on all of m,y figures,like my HFTD Ironhide,he has some stress on a side window.
I used to worry, and try to get them out with the hair dryer, but quickly found out that could warp the plastic BADLY. So, what's worse, a toy with a stress mark, or a highly melted chunk of fuck?