I think it all comes down to cost. For a DIY type like myself, I think a Marine Grade Oil Based Primer followed by a Marine Grade Oil Based Gloss Black does the job just fine. My Morgans are garaged, although not heated. Actually I use this same system on the Wood Body Frame. My Morgans are used Rain or Shine and often put away wet. When I do spot a bit of wood rot I treat the area with "CPRES" a epoxy product. One item that helps Me. I do not upholster the door rocker area and forward to the bulkhead. This way I can see it and water is not trapped. In order to make the door rocker area look a bit better (it does look a bit raw) I fill this area with 1/4" strips of ash and then disk sand to form a nice smooth threshold which I can paint or varnish. The "CPRES" treatment is interesting as it impregnates the rotten wood with epoxy. Epoxy does not rot and one can not tell it was used (if painted over). I know "NOT ORIGINAL".
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