Andrew wrote:
You only use the cleaner after you finish a tube, and not necessarily
after every tube - every 3 or 4 tubes is usually fine.

The gun has a metal rod down it's nozzle which is retracted to release
the foam, so the seal is made at the very tip of the gun. There is
therefore no foam exposed to air after you've finished, so nothing
dries up - effectively the gun becomes part of the can, not an
extension nozzle.

Because this valve mechanism is higher quality than on a disposable
can, it doesn't leak propellant, so a part used can keeps for ages.


Thanks - you've made a sale!

The important thing is to always keep a can on the gun, so you need to
have the next can ready for when you finish one.

Yep, understood.


--
Ian White