The wall is then saturated with water so, if taggers attempt to paint it, the paint won't stick.
It's an invention born of necessity.
"My father and I developed this 18 years ago. We had an appliance shop in Mangere and we used to get tagged every week," says Mr Bicknell. "All we could do was put a coating on the wall. It gets tagged and they give you a chemical to work with. Nothing suits. We just wanted to stop them, full stop."
He and his father, Bill, started out using a garden hose, an early prototype of what is now called Stormwall.
Then, six years ago, Mr Bicknell got serious about the product, formed a company and tried it out on a few businesses in Hawkes Bay. Flushed with its success, he acquired licences and patents for the invention in New Zealand, Australia and the United Kingdom, and is awaiting patents in the United States.
The key thing about the Stormwall technology, says Mr Bicknell, is that it stops taggers in their tracks.
"We want to be able to stop them. That's what GSS is: it's about preventing tagging in the first place."
The system is also environmentally friendly because it uses water instead of chemicals or solvents.
Mr Bicknell says the company is also looking into developing a system to harvest rainwater to use for the spray.
And it's not only taggers who are in the firing line. Anyone trying to use a doorway as a toilet is also in for a nasty surprise.
"As well as the Stormwall system we have the Stormdoor. That was designed on request from a client in Central Auckland. It stops people coming out of bars and urinating in their doorway."
KiwiRail is also a big client. Mr Bicknell's firm devised a system that protects trains and carriages from tagging while they are stabled at railyards. The first system was installed in Palmerston North.
Mr Bicknell's personal goal is to focus more on community-based jobs. Kia Aroha College is his company's first school and he is looking forward to working with more schools and councils.
But he also has his eye on the world market.
"We started the company in New Zealand. We got interest from as far afield as Paris, security companies in the US, a lot of interest in the UK. For me, it's about developing a product in New Zealand that you can take offshore."
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