Can I use it on gas pipes?
No. This is a water-rated PTFE tape and is not suitable for gas. Use a gas-rated jointing product for gas fittings.
Is it safe for drinking water?
Yes, it is WRAS listed and conforms to BS 6920, so it is suitable for use on potable (drinking) water pipework.
Which way do I wrap it?
In the same direction the fitting screws on, so it tightens rather than unravels, and keep it just back from the thread's leading edge.
How many wraps do I need?
Enough to fill the thread and seal, typically several turns, more on coarse or tapered threads. Pull firmly so it beds into the thread.
Will it work on plastic fittings?
Yes, it suits plastic, brass and other metal fittings and pipes, including radiator tails and male tapered threads.