Not sticky in so much as it will stay at the top of the blog, sticky as in very gooey.
The bottle has been filled with the spray foam that expands to fill gaps in brickwork etc. but before it set it was prodded with barbecue skewers to let most of the gas out. This left a very sticky lining around the inside of the bottle which was then shaped roughly to how I want the scenery to be using cotton wool to act as a barrier between my fingers and the goo.
This cotton wool has been spray painted to give an idea of how things will look. The whole lot now needs to dry for 24 hours before I can do any further work on the scenery. In the meantime the track pieces have been cut to length, soldered up and had the wiring attached.