I'd far rather not have to do any work on resin parts (just as I'd rather like not to have to remove mould lines from plastic or metal) but it's just not something that's possible for stuff made in the volume that it is
you can get almost mould line free/bubble free stuff but you'd need to be casting at a much slower rate and replacing moulds far more frequently,
even companies that I regard as producing far better cast than Forgeworld like Figone, Mierce, Kromlech and Kingdom Death still ship items with issues of bubbles, mould lines, mould slip etc
you just have to be prepared to do a bit of work on the aspects that bother you (I want to fix it all, take mould lines off my plastics and drill out gun barrels, others don't find some or all of these a problem)
and if it's something that's too much of a mess to fix most decent companies will replace stuff
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