Good clarification. I used it on my head pipe coolant o-rings to provide a good seal. The diaphragm application is much better suited to your suggestion, or perhaps a thin coat of Vaseline would work too.ducatiman said:with silicone seal there is an adhesive action and u don't want/need that in this application. a tear in removal would be costly. grease or paste has no adhesive properties other than temporary holding action and is the proper stuff to use here, IMHO.