blacktrumpet

Bought a van that was in an accident and tore off the rooftop ac unit. All that got fixed in a subpar fashion and the roof still leaked. I had a custom truck shop spray bed liner over the whole roof and then reinstalled the rooftop ac unit with “through the roof” sealant. 95% of the leaking has stopped but there are still a few places where I’m seeing signs of water. Is “through the roof” the right product for me? What autobody sealants are out there that would be better?