Two Quick questions

[combi6793]

Is PU expanding foam resistant to water (and cold)?

What should I use to lubricate zips on an awning?

Thanks

[John Rumm]

Water, generally yes. Cold certainly. Breaks down under UV exposure though, so you need to take care with it outside.

Chap-stick / lip balm is one commonly used on plastic zips. Graphite can work well on metal ones.

[chris French]

In message , [e-mail] writes

Wax from a candle rubbed along it? Or a silicone lubricant?

[The Natural Philosopher]

yes,. and up to a point.

Silicone grease..you can buy tubes, or spray cans.

[Jules Richardson]

I've got a spray can if silicone dry lubricant that I use on the padlocks for our sheds etc.; I expect it'd work very well on zips, too.