Making a sump

[blcard]

I have an existing sump that I'm adding some baffles to create a refugium.
My question is basically what type of epoxy to use. I read on another site to use weld 4, but what is this and where do I get it.
Any other suggestions would be great.

 

[thirty5]

Dont need to use epoxy. you can just use silicone, just make sure that it is aquarium safe. Some people will use a certain silicone from the major retail stores. But if you want to be 100% safe use the aquarium safe silicone, you should be able to get from your LFS

 

[veni vidi vici]

Silicone that says 100% Pure

 

[thacyko]

Your only going to use #4 if everything is acrylic. If it's a glass tank with acrylic baffles you have to use silicone