Hey guys and girls, getting ready to dig in and do a bit of scratchbuilding/kitbashing, and was wondering what would be a good pen to use on marking on the plastic for points I need to cut, add, etc. Something that of course could be perhaps washed off, or won't show through when painted!! Thanks a bunch.......BTW, I know some people will suggest using pencils, and while I do appreciate the suggestion.....I despise pencils.....it's just one of those things......but I appreciate your suggestions.