Police are cracking down on graffiti buffs trying to sneak a look at an “exhibition” of spray-painted artwork in an abandoned Brooklyn subway station.

“The Underbelly Project,” which includes the work of dozens of graffiti artists near a G train station in Williamsburg, has attracted scores of “urban explorer” wannabes willing to risk life and limb to see it.

After a newspaper publicized the site a week ago, even more people began flocking there, forcing cops to bust at least eight fans. Most offenders were charged with trespassing.