This may sound a little on the extreme side, but polyethylene tanks usually require a type of plastic welding process to fix holes and cracks. I had a polyethylene float on the boat lift spring a leak and fixed it with a stainless steel screw. I knew where the leak was (a pinhole as you described) and I drilled a small pilot hole through the tank wall and then took a #8 stainless screw and screwed it into the hole (a screw way bigger than the pilot hole). More than a year later, the lift tank is still in use and has no leaks. I would think this would depend upon the thickness of the tank and I do not know how thick the waste tanks on the Montana are. As an addition to the screw fix, I used a cupped stainless washer with the screw and put an o-ring inside of the cupped washer. I am definitely, curious as to how you finally get this resolved, keep us informed.
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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