Gray Tank Insulation

RollandB wrote:
I was surprised to see the area covered by the Coroplast showing a bit more surface rust than the frame totally exposed.

There was no seal (rubber, caulk or tape) of any type between the coroplast and flange around the perimeter. Any moisture that enters that area (I think that driving on wet roads creates a large amount of spray) will in turn not quickly evaporate since it is not, as you mentioned, "exposed".

Either the design engineer did not foresee such an obvious issue, or the assembly team did not build as designed.

I am hoping that full perimeter installation of butyl tape will prevent water entry.

I would have provided a photo of the insulation "toupee" (matted like a dog that had rolled in bovine excrement) but it was too gag worthy to retain for documentation.