When I toured the Monaco plant back in 2004, it was one of the dirtiest shops I ever saw. They sprayed everything with a rubberized undercoating. They made a good product, but that spray residue was everywhere in the build shops. We ended up buying a 2005 Diplomat and 10 years later, there was still no rust anywhere under the coach.
On my current and last Dutch Star, it's not coated like the Diplomat. However, when I do my yearly service, if I see a spot that looks like it's starting to rust, I just spray it with rubberized undercoating. It coats well and stops any issues.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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