Need to fix cracked tank ASAP

[Skep18]

I guess it could be more desirable to have a failure at a seam rather than the glass itself. Never thought about it that way.

I meant more like the flexible silicone might not fail when the glass deflects. The seam will be uneven but the flex of the silicone might allow it.

If the adhesive is rigid, it won't necessarily stop the glass from deflecting. If that deflection force is greater than the adhesive force to resist deflection, the seam would then seperate and fail because the adhesive is rigid.

That said, idk how much the seam "opens up" under the load of a full tank. I could be way wrong. Lol.

 

[SeaJay]

I meant more like the flexible silicone might not fail when the glass deflects. The seam will be uneven but the flex of the silicone might allow it.

If the adhesive is rigid, it won't necessarily stop the glass from deflecting. If that deflection force is greater than the adhesive force to resist deflection, the seam would then seperate and fail because the adhesive is rigid.

That said, idk how much the seam "opens up" under the load of a full tank. I could be way wrong. Lol.

We need a scientist.

 

[Erica-Renee]

Not Tank related at all but , There are many different formulas of Urethane Adhesives , Probably more so then Rubber or Silicone Rubber ..

I have been in the Construction Industry 30 plus years and have learned the Right adhesives for what Job, This is not science based just my opinion on what works best for me. Urethane based adhesives for the most part cure Harder and Stronger then silicone based adhesives. But there Life expectancy is much shorter as it ages it tends to crack flake and shrink away from what ever you are using it for.. Rather it be a sub floor adhesive or a Urethane adhesive for Concrete or flashing I have found For strength where it will be protected from moisture and sunlight urethane is best. but for direct sunlight . Constant temp changes and More wet then not silicone or rubber based is best.. Of course i always thrive to dry in and built things bases on the fact that no adhesives or silicone is needed to make the item water or air tight...
Just my Opinion.. Also urethane and Glass as far as i know is a NO GO TOTALLY..

 

[Skep18]

We need a scientist.

FWIW, I'm an engineer. The concept makes sense to me but its been my experience that concepts can fall short to real world experiences. Someone in the field would trump my word. That said, this is pretty specific. Not sure we'll hear from an experienced tank builder who has dabbled in alternate materials. lol.

 

[Skep18]

Urethane adhesive [...] where it will be protected from moisture and sunlight urethane is best.

Yea, that also pings my internal alerts. Something in my catacombs of memories is saying many urethanes (forgive the generality here) degrade after years of UV exposure. Some (if not all) light options utilize some amount of UV light.

 

[SeaJay]

Not Tank related at all but , There are many different formulas of Urethane Adhesives , Probably more so then Rubber or Silicone Rubber ..

I have been in the Construction Industry 30 plus years and have learned the Right adhesives for what Job, This is not science based just my opinion on what works best for me. Urethane based adhesives for the most part cure Harder and Stronger then silicone based adhesives. But there Life expectancy is much shorter as it ages it tends to crack flake and shrink away from what ever you are using it for.. Rather it be a sub floor adhesive or a Urethane adhesive for Concrete or flashing I have found For strength where it will be protected from moisture and sunlight urethane is best. but for direct sunlight . Constant temp changes and More wet then not silicone or rubber based is best.. Of course i always thrive to dry in and built things bases on the fact that no adhesives or silicone is needed to make the item water or air tight...
Just my Opinion.. Also urethane and Glass as far as i know is a NO GO TOTALLY..

Black urethane windo-weld is totally different than something like pl premium it does not crack or shrink at all. Every windshield in every car in the world since the 1980s is installed with it. It’s rated to adhere to glass with a strength of around 1500 psi, so I think your no glass and urethanes claim might have some holes in it. Also, urethane is widely used in marine applications, is on every car in the world and is often used to coat locomotives, water towers, etc. seems odd for a material that needs to be kept away from sun and moisture.

 

[Skep18]

Black urethane windo-weld is totally different than something like pl premium it does not crack or shrink at all. Every windshield in every car in the world since the 1980s is installed with it. It’s rated to adhere to glass with a strength of around 1500 psi, so I think your no glass and urethanes claim might have some holes in it. Also, urethane is widely used in marine applications, is on every car in the world and is often used to coat locomotives, water towers, etc. seems odd for a material that needs to be kept away from sun and moisture.

Sounds like more experience than I have with it all. lol. 1500psi is a lot. Perhaps its a situation of, "if it ain't broke, don't fix it." Silicone maybe just what is always what was used before and works barring no weird circumstances.

 

[SeaJay]

Sorry about your thread OP.

I guess I have to build a tank now...