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Paul. I think the water soluble rust inhibitors will only work on ferrous material. It converts FeO2 to a Layer of plastic, which then will not allow any further corrosion of steel, since it is sealed. In fact I read in the instructions ones that you 'll have to leave some rust on the metal in order to let the solution work. I would think the POR stuff will not work with aluminum because Aluminum requires a different chemical reaction. The web site on POR-15 tells us here http://www.porstore.com/dosdonts.html that: " Do use METAL-READY first if you are painting POR-15 on new steel, galvanized metal, aluminum, or any smooth metal surface. " What it means is that if no braun rust is existing, the stuff just does not work. The Metal-Ready stuff is just a primer. Besides, pure aluminum does not need this kind of treatment because the oxide layer buildup of aluminum is a corrosion inhibitor by itself. That's what we have alclad for. The problem arises only when this layer is heavily destroyed or inter granular corrosion starts or when electrolyses ruins your spar between steel attachment points and aluminum spar. I think for the latter one there is nothing better than ACF-50 or similar. Hartmut N3330H ######################################################### For those not familiar with it, POR stands for "paint over rust", it is a thin paint about the consistency of water and bonds to the surface with a vengence. If you get any on your body, you will be wearing it for several days as I have found nothing that takes it off. Also, because it is so thin, it runs EVERYWHERE. I was curious if anyone has ever used it on aluminum. ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm
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