What am I doing wrong with my sump?
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What am I doing wrong with my sump?

This is a discussion on What am I doing wrong with my sump? within the DIY Aquarium forums, part of the TFK Resources category; --> Im building a 10 gallong sump under my new 20 long. I've done alot of looking around online and seen people just put acouple ...

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What am I doing wrong with my sump?
Old 12-09-2010, 01:07 PM   #1
 
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What am I doing wrong with my sump?

Im building a 10 gallong sump under my new 20 long. I've done alot of looking around online and seen people just put acouple of dots of gel super glue then super glue and done.

I started with 1/8" plexi and that poped right out. I went to 1/4 plexi and that poped right out. I tried a couple of dots of epoxy and that melted. With a last ditch effort I epoxyed the whole thing then siliconed... each time I let the epoxy cure for 2 days and the silicone for 1 and it never holds. Also I clean the edges realy well before resetting and the baffels fit snug.

WHAT CAN I DO!? Everyone makes this look so easy.
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Old 12-09-2010, 02:36 PM   #2
 
Can you tell us what you are trying to do?
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Old 12-09-2010, 03:54 PM   #3
 
What kind of plexi are you using? Try sanding the edges a little. Personally, I use Weld-On. It is a bonding agent and works on a lot of different types of plastic, ive been using it for my DIY and its real strong, haven't had it fail me yet. Cures fast and is at 80% strength in 24 hrs. Silicon does NOT bond to acrylic, its basically useless unless you are using it to just coat the plexi to seal in superglue.
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Old 12-09-2010, 04:21 PM   #4
 
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Quote:
Originally Posted by Mikaila31 View Post
Can you tell us what you are trying to do?
sump baffels

Quote:
Originally Posted by SinCrisis View Post
What kind of plexi are you using? Try sanding the edges a little. Personally, I use Weld-On. It is a bonding agent and works on a lot of different types of plastic, ive been using it for my DIY and its real strong, haven't had it fail me yet. Cures fast and is at 80% strength in 24 hrs. Silicon does NOT bond to acrylic, its basically useless unless you are using it to just coat the plexi to seal in superglue.
I just put the first one in secured with marine epoxy... well find out tomorrow if it was strong enough. I've already done the seal super glue in with silicone with no success.
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Old 12-09-2010, 08:21 PM   #5
 
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not sure of the issue ... what type of silicone? i just cut mine snug (as you did) and simply siliconed them in.... i used 100% silicone 1 from GE and mines been up for 7 months with no issues... did you run the bead on both sides of the plexi?
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Old 12-09-2010, 09:44 PM   #6
 
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Yes I ran beads on both sides. The baffels keep comming comming out of place after a few hours. Same silicone (GE Silicone 1)

Last edited by JerseyBird97; 12-09-2010 at 09:49 PM..
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Old 12-09-2010, 11:34 PM   #7
 
well if the epoxy fails and the silicond oesnt work for you i recommend weld-on. Its a bit more difficult to get, but its a solvent with some acrylic in it already and it bonds by softening, the acrylic and then allowing them to fuse together, like liquid welding, hence the name. Its also a bit pricey 5 bucks for 4 ounces. Its hardish to work with but it bonds like WHOA. if you have the edges cut just right u can even get seamless bonds which look great
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Old 12-10-2010, 07:32 AM   #8
 
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ok ..hmmm this one honestly is stumping me and because its something i have a lot of experience with i am very curious as to the issue... after my post last night i contacted all the folks i have made sumps for (about 7) and they all report no issues... so lets start at the begining ... could you post some pix of one that did not hold? in particular the plexi and the placement, also the way the silicone is applied?
i am super intrigued at this point...
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Old 12-10-2010, 09:01 AM   #9
 
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Old 12-10-2010, 09:30 AM   #10
 
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hmmmmm it looks good my only recommendation would be to run your seals a little thicker (its not a display so it can be a bit less than pleasing to the eye... other wise i am not really sure..... please forgive me if i sound foolish here but i am simply asking obvious questions to get to the root of the issue....
when seting new seal you have emptied, cleaned and dried the tank removed all traces of old seal and cleaned area for new seal with alcohol. then after it dries set new seal and let set for 24-48 hours before adding any water to the system? againi have no doubt in your ability just trying to figure out the issue....
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