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**Mike Irwin** · August 11, 2010, 08:23 AM

I may be wrong in my assumptions here, but I always understood that VPI was essentially a very light, easily vaporizable (is that a word? I don't know) oil.

Oil vapor will, over time, kill primers. I've seen it happen.

If, however, VPI isn't oil, then it may not be an issue.

August 11, 2010, 08:23 AM	#6
Mike Irwin Staff Join Date: April 13, 2000 Location: Northern Virginia Posts: 41,380	I may be wrong in my assumptions here, but I always understood that VPI was essentially a very light, easily vaporizable (is that a word? I don't know) oil. Oil vapor will, over time, kill primers. I've seen it happen. If, however, VPI isn't oil, then it may not be an issue. __________________ "The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower.