I've used POR15 at work many times for restoration projects. Never used POR15 inside a tank, but it seals rust better than anything I've used. It leaves a powder coat baked finish over really nasty metal-and a hard finish. When you brush it on it comes out like a sprayed finish (self-leveling)- It's expensive but a perfect solution for extremely rusty,pitted,ugly metal that needs to look new when finished and sand blasting isn't practical (like inside an open place of business) or for those "tight-can't-reach areas".
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