Track making/making tracks: the good, the bad and the ugly, advice and thoughts wanted, explanation is giving(incl mistakes)

[Rhinochugger]

Ensure:
a) don't contaminate each roll with particles from the other roll.
b) wrap it up tight to keep the air out.

As it is a chemical reaction, then in theory if not mixed, it will last a long while, however as with most things will "go off" eventually, had mine about 5 years since first opened and still good.

When I first started with Interserve (based at Sandhurst) my shared PA was related to the makers of Milliput, and I had an unlimited free supply every time she visited her relatives in Wales.