Matt Damon on his fake long hair: 'It was gross'

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Matt Damon's creature feature blockbuster ready for US debut

Star plays European mercenary in the fantasy adventure film 'The Great Wall'

Beauty is hard work — just ask Matt Damon.

The 46-year-old actor, who stars in “The Great Wall,” had to take on a transformation of epic proportions.

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“I’d never done that before — 700 extensions [and] it took 12 hours,” explained Damon on getting his hair ready for the role to E! News. “The tiny glue [extensions], which is weird. And then I lived with it for five months…The kids loved it. The kids were into it for like a week and then they kind of forgot about it. I got good at doing the hair ties, just to get a ponytail up.”

Damon appears in the action flick as an English mercenary who battles monsters in ancient China, which required warrior-esque tresses that he doesn’t naturally have.

However, what became of Damon’s new mane? He revealed it’s somewhere in Hungary.

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“I flew from China and went to do a day of extra filming on ‘The Martian’ and so I flew to Hungary, landed, went into the production office, and cut all that hair off, and left it on the floor on Hungary,” he said. “It was a rat’s nest… It was so gross. It was so nasty.”

And that wasn’t the only thing Damon struggled with while on set.

“With a CGI arrow, I’m pretty damn good,” he explained on his character shooting a bow and arrow. “But with an actual arrow, not so much.”

You can catch Damon and his hair on the film went it debuts in theaters on Friday.