Sealing issues on the SendPro C Lite, SendPro C, SendPro+, SendPro C Auto

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Products affected: SendPro® C Lite, SendPro® C, SendPro®+, SendPro® C Auto  (2H00, 8H00, 9H00)


The device is not sealing or only partially sealing envelopes.


Sealing issues are usually caused by inadequate sealant in the moistener tank, or problems with the wick or brush in the moistener.


  1. Be sure to slide the envelope flap under the edge of the feed deck. Otherwise, the moistener cannot wet the flap.
  2. Check the sealant level by looking at the sight glass on the left side of the moistener tank.
    • If the sealant level is low, add E-Z Seal® solution until it reaches the bottom of the fill hole. Do not overfill the moistener tank.
    • If the tank was empty, allow 30 minutes for the moistener brush and wick to get completely wet before trying to use the moistener.
  3. Check if the moistener brush is dry. If it is:
    • Make sure that the white thumbscrews on the bottom of the sealer are tight.
    • Try wetting the moistener brush manually.
    • Make sure that the brush is contacting the wick. Lift the wick up slightly so that it is contacting the brush.
    • If the brush dries out quickly, replace the moistener wick*.
  4. Check if the moistener brush is dirty. If it is, remove the moistener brush, clean it in plain water, and rinse thoroughly. If the brush will not rinse clean, replace the moistener brush.
  5. Replace a worn-out moistener brush*.

*​You can order a Moistener Replacement Kit (#621-8) from the supply line, which includes a wick, shield, and brush assembly.

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UPDATED: February 19, 2021