Air/Gap in Silicone tank seal, also in acrylic overflow seam

[_Danny]

Noticed a vertical air bubble in the right front vertical silicone seam on my 180 gallon tank (1/2" glass).

The acrylic overflow that was made also has a spot where there are gaps/bubbles that almost go all the way through the seam.

Neither have had any water in them yet - purchased everything almost two years ago and life got in the way of continuing with the build until now.

Suggestions on what I should do?
Weld 16 for the acrylic seam? Inject silicone into that gap with a syringe?

 

[BrettDS]

I can't speak to the acrylic, but as for the glass, silicone doesn't stick to cured silicone. I think trying to inject more silicone in there and making holes to do so is going to be worse than just leaving it.

I suspect that you will be just fine, but you could always reach out to the tank manufacturer to be sure. A lot of tanks have longer 3 or 5 year or even lifetime warranties, so if they think it's a problem they may still replace the tank for you.

 

[Dsekula]

To quick fix acrylic I've used the two part found in acrylic nail kits. Play with some first and practice. You can also use acrylic shavings and weldon 3, 4, (and I though it was 14 not 16 but may be mistaken) to make your own two part to fill gaps. Using two parts gives more of a paste than water viscosity.
The glass is harder, to really do it right you would have to remove ALL the silicone and reseal it. As in every last spec since old dry silicone will not stick to new.om the other hand the half butt way to do it is remove all of the inside visable silicone but leave it between the glass and reseal only the top layer (brace the tank together first btw). The even more half butt way is just apply more silicone over the old making sure to go well over issue spots...
Obviously ways two and three arnt exactly recommend but I've seen them give extra piece of mind when situations we're desperate.
That said I've had tanks with much worse wear that had no issues. My first 55 gal has been in operation 20 years, I only resealed it last year (it was getting scary) when I moved and had to empty it anyway.

Sent from my E6810 using Tapatalk

 

[ReefkeeperZ]

the silicone will be fine. dont tamper with it. Again unless you plan to reseal the whole seam do not tamper with it any patch job on silicone is never even close to as good as a true seam.

looks like the acrylic you can just give a shot of weldon around the outside to complete the
seal. where the larger bubble is in the acrylic it should seep in as long as you squirt to one edge of the void and dont squirt over the whole opening trapping bubbles inside. I wouldnt worry about the three samll bubbles in the center of the seam just that one big one with the edge open to the right in the picture.

 

[lapin]

the silicone will be fine. dont tamper with it. Again unless you plan to reseal the whole seam do not tamper with it any patch job on silicone is never even close to as good as a true seam.

looks like the acrylic you can just give a shot of weldon around the outside to complete the
seal. where the larger bubble is in the acrylic it should seep in as long as you squirt to one edge of the void and dont squirt over the whole opening trapping bubbles inside. I wouldnt worry about the three small bubbles in the center of the seam just that one big one with the edge open to the right in the picture.

I agree. Try to turn the tank on end so the solvent flows down into the gap and the air can rise up and escape.