Since silazane and siloxane are ambient curable , is it wise to introduce FAS17 to increase hydrophobicity ?
I think you mean the silane (heptadecafluoro-1,1,2,2-tetrahydro)decyl-triethoxysilane (=FAS17).
A litte bit of humidity, time and/or acid/base will result in a siloxane.
Article Analysis of silanes and of siloxanes formation by Raman spectroscopy
If you really have a coating basing on a siloxane (or fabricate) a coating with a different silane you can combine the process with FAS17 (which is due to the ethyl groups slower than methoxy or chloro silanes (depends of on the not mentioned synthesis/fabrication procedure)).
But if you have a silazane which should remain a silazane (not result in a siloxane) an reaction with FAS17 is hardly possible. I think the reaction of water (humidity) is faster with the silazane than with an ethoxysilane.
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