glue/adhesive/seal for acrylic sump

[dempseyjosh]

hi, i want to add another baffle in my sump so i can add a refugium, i just need to know what exactly i need to adhere the two new peice in there and seal it too. i've seen some stuff that makes the acrylic softer so the peices actually fuse together, but i can't seem to find it again.
i was also wondering if any of this will work while wet, or if i had to empty the sump.
thanks

 

[loopy101]

im sure you will have to empty the sump... and for the life of me i cant remember the name of the stuff you need. i will prolly wake up at 3am and remember.... lol

 

[joncat24]

Weld on 4, and weld on 16 applied to seams afterwards would be the best.

 

[jackri]

Make acrylic softer? You have to heat it to do that.
Are you adding acrylic sheets in an acrylic sump? If so yes you need to empty and dry it. The stuff your looking for is Weld On -- I used #4 to put my frag tank and sumps together and should be more than adequate for putting in baffles.
Now if your doing acrylic to glass --- the weld on won't adhere to glass... and silicone won't adhere to acrylic -- but for baffles silicone would do the job as it doesn't need to be leak proof like the outer seams.
Hope that helps

 

[dempseyjosh]

TAP #4 Acrylic Cement is a free-flowing (capillary), solvent-type bonding agent for acrylic pieces. Generally it is used for edge gluing, since it softens surfaces and welds them together. It produces strong, optically clear cemented joints. Apply with brush, medicine dropper, hypo-solvent applicator, or syringe.
ok, that is exactly what i saw before, i just couldn't remember what it was.