im not taking the tank completely apart im just renewing the inner silicone lining cause its been eaten away overtime
That's better, taking the whole thing apart can be a job. I know a guy who took the whole 125 gal. apart. I mean, he had sheets of glass and the frame. Ended up trying to sell it just like that. I think he still has it.
Check this out: http://www.aquarticles.com/articles/management/Spinelli_Resealing_Aquarium.html
Go to The Home Depot or Wal-Mart, get 100% silicon Type 1.