Quite a rabbit hole I'm down on the revamp of my wash. Now that the chemicals are updated and not the same soap for 3 functions I can see that there are leaks in the walls separating the tanks. Was thinking about flex paste but worried about chemical resistance. Getting it welded is way too big of an endeavor right now. Was thinking a thick plastic rectangular container to drop in would work and last indefinitely but not sure where I'm going to find that.