Brad Pitt outstayed his welcome in Aston Martin garage during US GP weekend

Mike Krack was happy to help Brad Pitt and his Formula 1 movie entourage at the United States Grand Prix, but admitted their visit to Aston Martin had caused chaos.

The Hollywood star was in Austin on a fact-finding mission for the movie in which he will play a racer who returns from retirement to mentor a youngster and take his own final stab at glory as his teammate.

Lewis Hamilton is involved in the production and, along with his Mercedes boss Toto Wolff and F1 CEO Stefano Domenicali, dined with Pitt on the eve of the Circuit of The Americas race weekend.

Pitt then met up with all 10 F1 team bosses and spent much of his time at the track in the Aston Martin garage - apart from exchanging a few reluctant words with Martin Brundle during the pre-race grid walk.

Team visit

But while Aston Martin team principal Krack did not mind giving the film personnel access to discover what goes on behind the scenes, he did suggest they had perhaps outstayed their welcome by a fraction.

"They were with us for a very long time, much longer than expected," said Krack, quoted by Motorsport-magazin.com.

"To be honest, it even threw our schedule off. We were a bit stressed then!"

Having revealed that team owner Lawrence Stroll "was also involved", Krack hopes the project will be a big success - with Hamilton saying he wants it to be "the best racing movie ever".

"The producers are very serious and professional," said the 50-year-old from Luxembourg.

"This is very positive for the whole sport. We will support the project as much as we can and see to what extent we are involved. Their goal is to make the best F1 film. I'm sure they can do it."

Some big names from the movie world have been enlisted, with director Joseph Kosinski and producer Jerry