Can I put more silicone over new (but dried) silicone when sealing glass aquarium?

[That Reefer Man]

UPDATE: So i bought another used 100 gallon, and set it up so I could get my fish back in to something larger, they were tearing each other up in the 35 gal hospital tank

I have a friend that is letting me use is garage for taking apart the other tank. I want to completely take it apart... so far i have all the silicone scraped off from the inside but now i need to buy a putty knife to get the trim off top and bottom. My questions about this: when i put the silicone between the panels, do i use that excess as the silicone on the inside or do i wipe it clean, then re=apply more silicone on the inside?

thanks for all the replies you have really helped me out!

 

[Blacktank]

Wipe it clean of the excess and wipe it down with the acetone. Let it cure for at Least 3 or 4 days, a week is better. Then apply the clear silicone and let it cure for a week and then do your water test

 

[Aquaman024]

Do not put silicone over silicone. It will not bond.

 

[1987]

everyone has given great advice, I've done a few tanks using these methods. Just take your time and wear gloves. Let it cure for a week. if its really cold where the tank is I let it cure for two+

 

[glassguy]

Silicone actually sticks great to silicone...do it all the time. the problem is the old silicone is not stuck to the glass, no adhesion or a pinhole. Best product to clean with before sealing to glass is Isopropyl alcohol due to a high flash point (evaporation). I would cut out area of leak the best you can and reseal. Dow makes the best sealant product on the market. Dries tacky in in a few hours with acid cure. Structural sets in 2 to 3 weeks.
Best of luck