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I use the metal prep on bare metal, you should too. Posted by Notnoel [Email] ![]() ![]() In Reply to: Re: POR 15 wheel wells/drive shaft tunnel?..., PaulS ![]() |
Probably won't add much if you are painting over a finished, but....
Assuming you believe their instructions (an it's such a great product, why wouldn't you?), the metal prep does two or three very important things: 1) it's a phosporic acid, so it etches the metal; 2) it actually removes some surface rust and penetrates the deeper pitted areas (you can see it preferentially bubbling over the rusted areas); and 3) it leave a coating of zinc phosphate on the metal. According to their literature, POR-15 is formulated to bind to zinc phosphate.
Metal ready is pretty cheap by the quart, and rust being what it is, I always go whole hog on the rust inhibitor after all of the trouble it takes to get as much of the cancer out of the car as possible. I have many small scars on my hands from rust removal projects over the years, and I do not like going back into a place I've been to before.
Your mileage may differ.
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