My Nova tank had a crack around the top of two dividing sections as shown in photo 1. The tank was thoroughly washed out and then dried for three days near a radiator. Using a cotton bud I then cleaned the crack with some upvc cleaner (acetone). You can use petroleum ether and then wash it off with water but I did not want to have to dry the tank again. A ratchet strap (with blocks of wood to protect the tank and apply pressure where it was needed) was placed around the tank loosely. I gave the tank a blast with the wife's hairdryer to drive out any remaining water from the cracks. The Tensol 12 was taken out of the fridge and dripped into the cracks, I helped it into the cracks using a long matchstick and tilted the tank accordingly. Alternatively you could use a syringe.The ratchet strap was then tensioned to close the cracks. Be carefull not to apply too much pressure as the tanks are in my opinion quite fragile. I then left the tank to dry.
I also experimented with glues I had around the house, Tensol 12 as expected made a firm contact and held fast, it actually melts into the surface of the acrylic. Araldite made an equally strong joint and had better gap filling qualities because of its thick viscosity. Full strength super glue was not a great success, the bond between the two pieces was easily broken. Fiberglass epoxy resin hardly made any kind of bond at all and it was easy to snap the two bits of acrylic apart. If I could not get hold of Tensol 12 I would not hesitate to use Araldite, but beware that as pointed out by one of our friends on the forum darkroom chemicals can attack and breakdown Araldite over time. I would not attempt to build a tank using a two part epoxy resin but I am confident it could be used to make a small repair. The Tensol 12 was purchased from Trent-Plastics (Gainsborough) on Ebay at a cost of £8.85 including P&P (it was delivered the next day). Tensol 12 is quite thin, there is another type of Tensol called Tensol 20 that is thicker and has better joint filling capabilities but it is much more expensive.