A vinyl album normally has a surface that's barely cupped. Using a sanding block will cause the outside and inside lands to be sanded more than the center lands. In my experiment, the center lands of my test record remained un-sanded even though I over-sanded the entire disc (one side) to see how much damage over sanding could do.
Shoes (Spencer Hill Remix Radio Edit) - Tiga - Shoes (CDr), Des Yeux Trop Bleus - Dany Dauberson - Les Mots (CD), Renato Zero - Voyeur (CD, Album), Mirage (12) - Jack Mix IV (Vinyl), Helkkää Pienet Tiuut - Various - Valkea Joulu (Cassette), High On The Hog - Various - Nardcore (Vinyl, LP), Who Is Billy - Roy Davis & Jay Juniel - The Men From The Nile! Pt. 1 (Vinyl), Most Def - Onyx - Afficial Nastee (Cassette, Album), LUltima Sera, Crazy Bout You Baby - Sonny Boy Williamson (2) - Down And Out Blues (Vinyl, LP, Album), Seltsam.Com - The Customers - FreeCustomer.com (Vinyl), Cold Frontin - The Showboys - The Ten Laws Of Rap / Cold Frontin (Vinyl), All Black - Clipping. - Splendor & Misery (Vinyl, LP, Album), Kanape - Various - Ignored 07 (File, MP3)