Resealing tank

[mark]

I can't see any problem resealing a tank if the old bead is removed (nor why it would be weaker). When you remove the old joint you're just removing the filleting (unless disassembling), the actual thin bond is still there between the two pieces of glass. As for sticking, even if it didn't to the old silicone, it's only the ~1/16" seam, bead is still going to extend over either side and adhere to the glass.