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I have never done hydro dipping on anything, but I want to put a reptile skin pattern on a Repulsor or Balistus Dreadnought. There are a handful of videos showing hydro dipping 40k vehicles, but it doesn't seem at all popular. Is there some horrible negative that I'm missing?

I think this looks cool-
https://www.youtube.com/watch?v=QARySbDlc1Y

I haven't but check out Blisful Badger
https://www.dakkadakka.com/dakkaforum/posts/list/813705.page