I've spoken to another hot dip galvanising company who said they would not do the subframes as the holes in them are too small to allow for air to escape as soon as they are dipped in the 450-500C vat which would cause an explosion or deformation.
They also said the best course of action is to sand blast it then get it powder coated to a rough finish and then paint it with some proper boat paint for best result.
They also said that its the temperature shock which can warp and cause the subframes to crack and that ovens that poweder coats use heat up gradually to completley avoid this risk...
so it looks like a no go unless someone else has a better idea?
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