Subject: Are there any circumstances in which a lubricant can INCREASE friction?

I performed an experiement to investigate the lubricant effect of different 
substances, including many well known lubricants.  However, when compared to a 
control (where no substance was applied), all substances actually increased 
friction rather than decreased it!  I understand that the lack of pressure in 
the fluid lubricants prevented fluid film lubrication but i cant understand 
why there was no boundary lubrication.  And even if there was no boundary 
lubrication i still cant understand why it would INCREASE friction. i have 
looked everywhere for an explanation and I just cant find one.  you are my 
last hope.

Re: Are there any circumstances in which a lubricant can INCREASE friction?