That is a possibility. The seams of where the new foam meets the old foam would need to be sealed perfectly, or you are back in the same boat. The other problem is controlling the foam to be a light layer so that you aren't going backwards by having to carve the new foam.

I would let the tank run the way it is for now for a week. If you do have more leakage. There are a few solutions I do have for you. But let's not get ahead of ourselves because those really do involve pulling off the 5 tons of silicone in there, and recovering it with another substance.

I am going to address this in the construction thread when I get to the point, but the thing you have to differentiate between is a sealer and a sealant. A sealant essentially seals the top layer of a material, and a sealer will absorb into a material and truly seal it from the inside out. Once you carve foam, you need to use a sealer. Silicone is a sealant.


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