I'm sanding the body to get out the nicks I made while installing the parts, and I noticed this crack. Not sure how it got there. I've started to try to sand it out, but could that make it worse somehow? Would it be better just to fill it with Z-Poxy or something? I do want to do a semi-trans finish (dark reddish). I can just barely catch on it with a fingernail, otherwise it's smooth to the touch. But I don't really know how deep it goes.