I would use Momentive RTV silicone. I used to use DAP 100% silicone or GE-I, but after trying out the Momentive I will never go back. Not only does it dry clearer, harder, and stronger, it also spreads much nicer.
My advice on resealing:
Buy one of those plastic holders and a box of straight single-edge razor blades.
Clean the tank well with vinegar prior to starting, especially around the seams. Any mineral residue or grit will dull your blade and abrade the glass.
Toss the old blade after every seam and use a new one. You will spend a couple extra bucks, but it's worth it.
Be sure not to leave any film of old silicone because the new stuff won't stick to old silicone. Make sure you have good lighting so you can see any residue.
Do the best you can sealing around the top trim, especially in the corners - it is really annoying to get a slow drip from condensation/splashing making its way through the trim.
Have plenty of paper towels on hand and clean the tip of the caulking gun after each seam is applied. There is a little release on the gun that you pull to stop the caulking from oozing out after yo stop pumping the trigger.
I spread with a finger, but some people have good results using plastic spoons.
Do the bottom seams first, especially if you use gravel/sand. They won't show and by the time you finish with them you will be "in the groove" to do the ones that show.
Good luck!
My advice on resealing:
Buy one of those plastic holders and a box of straight single-edge razor blades.
Clean the tank well with vinegar prior to starting, especially around the seams. Any mineral residue or grit will dull your blade and abrade the glass.
Toss the old blade after every seam and use a new one. You will spend a couple extra bucks, but it's worth it.
Be sure not to leave any film of old silicone because the new stuff won't stick to old silicone. Make sure you have good lighting so you can see any residue.
Do the best you can sealing around the top trim, especially in the corners - it is really annoying to get a slow drip from condensation/splashing making its way through the trim.
Have plenty of paper towels on hand and clean the tip of the caulking gun after each seam is applied. There is a little release on the gun that you pull to stop the caulking from oozing out after yo stop pumping the trigger.
I spread with a finger, but some people have good results using plastic spoons.
Do the bottom seams first, especially if you use gravel/sand. They won't show and by the time you finish with them you will be "in the groove" to do the ones that show.
Good luck!
