Hup!

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Across
  1. 3. Important to maintain this, for sanity's sake
  2. 4. Less commonly used in taxidermy for brightening skulls
  3. 6. A guarantee of financial security (two words)
  4. 7. In microscopy, the viewing sample as prepared
  5. 8. One of the Wright brothers, for example
Down
  1. 1. Perpendicular to a plumb line
  2. 2. The pathway to corporate success, in a manner of speaking
  3. 4. The one with the cold?
  4. 5. Prepared for action, in Spanish parlance
  5. 6. Like some voters