resealing a tank

Hi there, I just got my hands on a 75 gallon tank that was in rough shape with the seals. As i have never done this before with a tank, I'm looking for any help on tricks or information on how to do so. My main question is, do I have to seperate the glass and do the complete seal or can I strip off the old inside and then just reseal fromt he inside. The seal across the bottom of the tank seems fine and it is only the edges on the sides that are a bit old. The tank came from an aquarium and was already predrilled on the bottom, but the previous owner sealed that with a plate of glass. I don't have any worries about that leaking as its got a very good seal around it. What I do have a worry about is only resealing the sides. should I just reseal the entire tank or will the silicone adhear to the silicone across the bottom? If so, is a company called xiameter a good place for buying silicones online? I've heard good things about them but just wanted to double check.

 

I have done a few over the years and found the best way is to remove all of the silicone from inside the tank and reseal the hole tank at once, silicone will not stick to old silicone , and no do not separate the glass panels. a trick i found after you cut the silicone loose put a little powder on a paper towel to brush the silicone bits up, it keeps it from sticking all over the glass and will highlight the little bits left behind that you missed, then i wash mine out let dry a day and reseal and let that dry for a few days before using.

 

+1 to that, the powder trick comes in real handy

 

Very interesting tip there homegrown with the powder. I have resealed a 225. it can be done and isnt that hard. just take your time to make sure all the silicone and silicone residue is GONE before doing the new. be careful not to damage the seam between the panes. this can be left intact and still get a great seal. be sure to use some acetone then rubbing alcohol to make sure there is NOTHING on the glass where you are putting the new bead.