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Message: <blockquote data-quote="thill" data-source="post: 507506" data-attributes="member: 4972">I have used it many times for many years, and it works well, if the surface is nice and clean.   I typically use a mix of 50% Purple Power, 25% bleach and 25% water applied with a spray bottle or garden sprayer.    Then I agitate it with a brush on a stick, let it work for awhile and then powerwash everything clean.Once it dries, the aluminum primer grips well, and the paint on top always looks good.  I can't remember it ever having an issue, so I almost always use it.  I probably have 5 cans in my shop right now.</blockquote>