Exhibit 10.4
June 23, 2009

D. Emerald Investments Ltd.
85 Medinat Ha Yehudim
Herzeliya, Israel

Attention: Mr. Roy Harel

Dear Sirs:

Reference is hereby made to (i) the Guaranty dated as of May 10, 2005 (the
“Guaranty”) by Polystick U.S. Corp. (the “Guarantor”) in favor of D. Emerald
Investments Ltd. (“Emerald”), (ii) the Pledge Agreement dated as of May 10, 2005
(the “Pledge Agreement”) between the Guarantor and Emerald and (iii) the Voting
Agreement dated May 11, 2004 between the Guarantor and Emerald (the “Voting
Agreement”).

Guarantor hereby (i) waives notice of the restatement and amendment of the
Convertible Note effected pursuant to an agreement between GSV, Inc. and Emerald
dated as of May 10, 2009, and (ii) consents and agrees that each reference to
the Convertible Note contained in the Guaranty, the Pledge Agreement and the
Voting Agreement shall be deemed a reference to the Amended and Restated
Promissory Note dated as of May 10, 2009 executed by GSV, Inc. and delivered to
Emerald.  The Guarantor hereby acknowledges and confirms the full force and
effect of the Guaranty, the Pledge Agreement and the Voting Agreement.

Very truly yours,
 
POLYSTICK U.S. CORP.
   
By
/s/ Sagi Matza

 
 

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