want to borrow proTEK (protective coating)

Hi, 

Sorry to spam. I am doing a KOH etch from the backside of the wafer. But my front side of wafer has Al, which can't survive in a long time KOH etch. I am wondering if  anyone have proTEK (http://www.brewerscience.com/products/protective-coatings) or have used the proTEK before to protect the frontside of the wafer? Any comments and suggestions are welcomed.

Best, 

Helen

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Qiushi(Helen) Ran
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Cell: 650-796-1439

Ph.D. Candidate
Department of Electrical Engineering,
Stanford, CA, 94305