I seem to have a knack for destroying my black tank

I used the Plasti-Mend to fix a crack/small hole in septic tank drain line cause I didn't want to dig out line to replace. Worked very well.....but no pressure like weight of full tank would cause.

I would use it to 'patch' by affixing a piece of flat ABS over the gash vs just filling gash (fill in gash and then cover)

12" X 12" ABS SHEET