Update: just got the hammer. IMHO, it's not worth the price I paid for it (around 150 USD) Yeah, it looks good, but it's too plasticky for my taste. It's a tad too light, and the washes for the weathering are below average to say the least. But hey, if the only alternative is to cough up an extra 500 bucks for an EFX, I guess beggars can't be choosers. :unsure
Update: turns out the stuff I said about rub n' buff above is not the right way to "repair" that thing at all. Like I said above, the weathering is basically a big wash, done pretty unevenly with a HUGE brush (most likely a flat paint brush, because of the visible strokes) So repairing the finish basically amounts to redoing the wash. I redid mine, just because the stock one was so "meh". Here's what I did: I started by toning down both the strokes and existing wash with a fine steel wool. Then I went all over the hammer head and tip with some heavily diluted black acrylic paint, focusing on the grooves. After that I applied dark gray/black Fuller's earth on the head with a big puffy brush to create a smoked/burnt effect. Then I sealed everything with a flat clear coat. The changes are subtle (I don't even know if they'll show up in pictures) but the hammer looks better in person afterwards. Don't get me wrong, it stills looks and feels like a toy; but it does looks marginally better.
Also, I removed the screws from the handle cap (mainly to remove and weather the "leather" strap) and, while the handle is hollow, there's not really a way to insert anything in it without compromising the cap's integrity because of the way the screws hold onto the plastic. Well maybe there is but it'll involve some major modification for sure. I'll think of something.