hello everyone, I recently acquired this 600 gallon acrylic aquarium. The back panel has quite a bit of crazing although it is NOT on any of the seams. Can this be repaired? Hopefully you can see it in the pictures.. I've been wet sanding but don't seem to be making any progress. Any help would be greatly appreciated.
Crazing in 600 gallon
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- Thread starter Awchris
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Cabinetman
Well-Known Member
Wow. I’ve never seen that before. How thick is the acrylic? Dimensions?
Cabinetman
Well-Known Member
My guess it’s stress cracks from being so tall and only 1” thick material. The tallest I build out of 1” is 30” tall. 48” tall using 1” is pretty wild.
48 is totally doable with eurobracing. There will be some bowing but it shouldn't be crazing like that. Makes me think it was flame polisher or something.
@Lowell Lemon .. what do you think?
@Lowell Lemon .. what do you think?
Cabinetman
Well-Known Member
Euro braced or not 1” material is way to thin for a 48” tall tank in my opinion. I’d like to see how much deflection there is on the front and back when it’s full. That flexing will cause stress fractures. I’m surprised there’s none in the seams!
It is not ideal but it is by no means "crazy". I saw a 10 yo 30" high made out of 1/2". It looked like a water balloon but it didnt have crazing like that. That must have been subject to heat...like maybe a south facing window?
Lowell Lemon
2500 Club Member
Even the old Acrylite formula calls for 2" on a 48" tall panel. Actual water depth might only be 44" but that still calls for 1 3/4" on the bleeding edge of thickness. It looks like stress cracks to me with possible chemical attack from window cleaner or something with petroleum distillates in the product. Even rubbing alcohol could cause this type of attack with the added pressure of a thin panel. I personally would not use this tank as it will bow like a balloon and the additional sanding and polishing will induce more stress cracks not less. I guess I would cut the water depth to 30" to make it more in line with the best use of 1" material.
Lowell Lemon
2500 Club Member
Just by the photo I think zero issues is maybe a stretch....but that is just me.
Lol.. definately not zero issues.
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fishguy242
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measure ,fill er up ,check the bow,use a t square, can always use longways paint bad side build custom stand,if useable 
So obviously this tank will bow to some degree. How much vowing is to much?measure ,fill er up ,check the bow,use a t square, can always use longways paint bad side build custom stand,if useable
vetteguy53081
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Ive seen this and worse. It looks aweful but is Not structural.
It sounds retartded but you could reverse tank as it has the overflow on the end and make this surface the rear of tank unless you have the same on both sides or are going peninsula.
Will be interesting to see how this buffs out. This obviously is a machine, not hand buffing requirement
It sounds retartded but you could reverse tank as it has the overflow on the end and make this surface the rear of tank unless you have the same on both sides or are going peninsula.
Will be interesting to see how this buffs out. This obviously is a machine, not hand buffing requirement
vetteguy53081
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I like the tall version of the 600g series. The other one I know of is from @Feet4Fish who owns a very clear one.
I have a 660g which is 32" tall but is 9.75ft long
I have a 660g which is 32" tall but is 9.75ft long
fishguy242
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Cabinetman
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I’m amazed the seams are not all fractured...
The other panel is good with no crazing. Ive begun sanding buts definitely a learning process as I have never done this before. I've sanded the entire tank to 2000 grit but will have to redo the inside of the good panel. It looks like the sanded failed to remove small scratches
