Hi George, I have been using POR for many years. All you have to do on normal metal is brush off the loose rust and apply the paint. Believe me when you use it on anything but exhaust manifolds it will never come off or rust again. Moisture makes it harder. I did not clean the lid of the can good enough one time, And the lid would never come off. I had to cut the can open. I have used it to apply molding clips that are broken when you can't find a replacement. I painted the exhaust manifolds on my 63 10 years ago with out sand blasting and it is a daily driver. It is just now getting to the point they need repainting. I believe sand blasting would extend the life time. But you have to remember POR is a paint and with the manifolds getting so hot and then cold over the years. Almost any coating will give up its cover . Gary Barker News4ge@xxxx wrote: > Hi, > > I've been trying to find out if POR15 gray manifold paint is any good and if > it can be used without totally cleaning off the rust. Apparently, > sandblasting is required for long-lasting results. Since POR means "paint > over rust", this is kind of misleading. > > Now my question, since sandblasting is necessary anyway, is "what kinds of > header paint have you all used and what would you recommend"? > > Thanks, > > George Clineman > > [Non-text portions of this message have been removed] > > > To send a message to this group, send an email to: > Chrysler300@xxxxxxxxxxxxxxx > > For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm > > To unsubscribe from this group, send an email to: > Chrysler300-unsubscribe@xxxxxxxxxxxxxxx > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/