"The legacy of the Banksy is there's an incredible street art scene now. So many local artists, so many walls are covered in colour and amazing art," adds Paul.
"The colour of the town has changed. It's gone from being a grey, industrial town where the skies are full of smoke all the time to being a really colourful town."
Doing the research for the play helped give voice to people who "often have no say in what's happening", but it also revealed to the pair the breadth of talent across the arts in Port Talbot.
"What's beautiful about this play is you see it from a community's point of view, and you see it from all those voices you would never normally hear, who would never get a chance to tell their side of the story and what that art meant to them and how important it was to their town," says Tracy.
"It's so poetic sometimes the way they describe it."
Paul says at the start of the process they had assumed at some points they would have to write in some lines to join the pieces of the story together, but found that their interviewees had done it for them naturally.
"The people of Port Talbot are incredible storytellers. I don't know what it is – it's probably a Welsh thing, it's definitely a Port Talbot thing – they are very good at telling their story," he says.
Tracy chips in: "We couldn't have asked for them to say anything better. It's almost like you couldn't write it sometimes. You're like, 'how did you say that? It's exactly what we needed you to say'."
Port Talbot Gotta Banksy is at the Sherman Theatre, Cardiff, from 2-10 May and then on tour to Port Talbot, Swansea, Milford Haven and Wrexham.