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I always thought grey permatex was good enough but than someone mentioned that Hondabond is a better overall RTV. So is Mazda Grey not the same as Honda Bond and is just the labeling made by Permatex for all?
I use AC Delco gray RTV for just about everything. But I work for Buick/GMC and usually have stuff left over from jobs. I used that to seal the baffle plates on my cover without any issues or deterioration.
The Permatex BLACK is the highest oil resistant for that bran and similar. The OE seal suppliers(like felpro/mahle) have good quality rtv and is usually black. Obviously OEM stuff like hondabro is top quality. But to make any of them work requires proper prepping of both surfaces.