Ideas for reversing weld-on#3

[sponge brain]

Can anyone tell me how to remove a piece from an acrylic sump that has been glued to the wall with weld on #3 and not leave any chemical residues undesirable in the sump ?

 

[bang guy]

Weld-on #3 creates a molecular bond between the acrylic pieces. You'll have to cut it off. It's now a single piece of acrylic.

 

[sponge brain]

Lifereef emailed the same answer.
so much for that idea !
Thank you