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Message: <blockquote data-quote="DiverJosh82" data-source="post: 421495" data-attributes="member: 21471">Hello all,  So I am going to be applying a coat of Rustoleums bare metal primer on to a thin layer of their self etching paint today but I need some help..  I am going to be spraying it on and I have a math question.  I think I am going to thin it a tiny bit to help it flow through the gun a bit better.  Now on the can it says to thin no more than 5% by volume with mineral spirits but I am terrible with math and can't figure that out lol.  First can I just thin it in the rusto can and will it be ok if I don't use it all?  And if I do it in a separate container I probably will do small batches of 10oz or less.  So if I do 10oz whats 5% of that? 10x.05 is .5. so do I use half an ounce or thinner?  Sorry for such a trivial dumb question..Josh</blockquote>