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Alex all the alloys used for “enhanced” coatings are vulnerable to salt corrosion so I’d say not a good idea in your location. The only thing that stops this is an SiO2 overcoat. And as you know with SCTs and maks the overcoated mirrors in a closed OTA can last many decades.
I think in general the so-called “enhanced coating” are pointless unless they are overcoated as well - as done in the SCTs in recent years (Starbright, XLT etc).
The reason is that if you want the ultimate reflectivity it’s now feasible to DIY coatings using the Angel Gilding kits to coat with silver and there’s a way to overcoat it to make it last ~2 years.
Given the situation here for anyone seeking to recoat a large mirror > 12” I’d suggest this is probably the only viable option short of sending it to the US to be done there.
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