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The complete POR-15 system is pretty good for stopping and sealing rust. You have to get oxygen directly to the steel to get rust, and POR-15 used properly will seal off the oxygen.
While the POR-15 paint is good by itself, when you use the complete process it is much better. First you apply a cleaning solution. Then you apply a metal prep solution which bonds a sealing coating to the surface of the rust. After this you paint it with the POR-15 paint. Not going to rust after that.
And its tough enough for battery trays.
Speaking of rust and battery trays, anyone with a vintage MB better take out their battery and look under the tray for rust. Stop it while you can with POR015 - don't let it eat through the firewall.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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