tools for resealing a tank.

[Delphinus]

Copious amount of razor blades... elbow grease, and a dashing of swearing to keep you sane as you go.

I've used clear Silicone I for sump baffles and it yellowed on me after a week or so. Structurally it was OK and chemically but it looked bad.

I understand that tank builders use GE1200, GE RVT100 or GE IS800 silicones. I found all 3 to be substantially difficult to find. Bow Valley will sell you a tube or two of GE1200 for about $10/tube. Check also with the folks at Red Coral because they may have something onhand as well.