YouTube can been a fantastic resource for cult classic movies. I try to keep a playlist of full-length '80s movies on the RD80s channel, but it's hit-or-miss with adding films that will actually stay on YouTube for an extended period.
It appears that Paramont Pictures is serious about distributing some of their cult classics on YouTube since the created their Paramont Vault channel in December 2014. Thanks to a tip from Heman.org, I jsut learned that the 1985 Masters of the Universe movie is one of the full-length films now available! Other movies include D.A.R.Y.L., Missing In Action, American Ninja II & III, and the 2014 documentary Turtle Power that chronicles the history of the Teenage Mutant Ninja Turtles.
Although the film quality is just 480p, I applaud Paramont for making these films available for free. Besides, it might be weird veiwing these cult classics in high definition! Enjoy Dolph Lundgren, Frank Langella, and a young Courtney Cox in Masters of the Universe and be sure to subscribe to the Paramont Vault channel for more '80s movies!