Sealing a fuel tank

[boxhead]

Not Cobra related directly but figured I would ask.

While tidying up the yard and using the brush cutter, I sat it down while replacing the nylon blades on the quick change head, when I sat it upright again I noticed a fuel leak.
The plastic tank has gone brittle and has alot of crazed cracks through it and 1 leak.
I have contacted Makita regarding a new tank but suspect they will tell me no parts available as it is outdated model.
I would prefer to keep it as it is in really good nick apart from the old fuel tank.
I recently had it apart and the piston and bores are near perfect, it starts and runs beter than any others I have had.

So if I can not get a tank is there a product I can use to seal the tank with?
I would prefer something clear but would use something not clear if it will work, flexable would be good.
I am guessing it would be something that is a 2 part sealer, mix together and pour into tank, move it around to coat all surfaces and pour out excess fluid.

Thanks for any tips.