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Originally Posted by over40pirate  Speaking of rust. Has anyone had any experience with POR-15 rust preventing paint? In a salt environment, I have found it's impossible to keep steel parts from rusting. Maybe POR-15 might work. |
I've used POR-15 paint on a gearbox, engine mounts and other parts. So far so good (12 months). I bought it after being somewhat impressed by the distributor's antics - he struck a metal rod painted with glossy black POR-15 with a hammer right in front of my nose, then bent it 90deg, and it didn't crack or chip. But, you wouldn't know whether he prepared and painted his sample via 'special' preparation or not (probably).
Disadvantage: The paint hardens with moisture, so once opened, it tends to have limited shelf life (mine was lost after 5 months on shelf).
You need proprietary preparation, unless the metal surface is in ideal condition for the paint.
Also, when you paint cast iron, you have to make absolutely certain that the metal (and any pores) is bone dry, else it comes off.
According to the distributor, the manufacturer approves it for use up to 250F, which should mean it can be used in the engine bay of a small yacht.
(No, I won't hammer my gearbox to see how it stands up.)
Martin