Hi MF, my mate lives next door to him and he has asked my mate to see if he can fix it and my mate asked me if he could use some 2 pak repair stuff he paid $40 for. I told him I didn't think it would work. I asked him to read out to me what was on the packet and once he got to the bottom of what materials it would repair it had a note, not suitable for HDPE. I could make a 3mm steel tank for it but as you say why bother.