Britney Spears -- Dad Scores with Duct Tape

Britney Spears' dad learned a lesson in swag ... you gush over a product and the company that makes it will probably send you free stuff ... which brings us to duct tape.

During the "I Am Britney Jean" special Jamie Spears couldn't stop talking about his obsession with duct tape.

Now enter a company that manufactures "Duck" tape ... someone heard Jamie and the company sent him 1500 yards of the sticky stuff ... enough to span 15 football fields. Yeah, we know our sports.

The company sent various colors, including classic grey.

After the special, Britney tweeted bout her dad's infatuation saying she's gonna buy him a ton for Xmas.