The word sandpapered is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 20
Highest Scoring Words With Friends™ Play In The Letters sandpapered
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Seven Letter Word Alert: (23 words)
appears, appease, appends, danders, dappers, deadens, deadpan, depends, dresden, endears, nappers, padders, panders, papered, paraded, parades, prepend, reddens, respade, snapped, snapper, speared, spender