Is this a flaw in new cast iron?

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Forum topic by Soupy6914 posted 01-20-2017 09:15 PM 712 views 0 times favorited 4 replies Add to Favorites Watch
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01-20-2017 09:15 PM

Topic tags/keywords: jointer

I just bought a new powermatic 8” jointer I removed all of the shipping oil with mineral spirits underneath I found little gray spots all over. I’m just trying to find out if this was a bad casting? What do you think?

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#1 posted 01-20-2017 09:27 PM

Looks fine to me… as long as it’s flat, slap some wax on there and start making stuff.


-- Brad in FL - In Dog I trust... everything else is questionable

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#2 posted 01-20-2017 10:14 PM

If it was a mirror I’d take it back. Since it’s a jointer, I’d setup it up and flatten some wood with it!

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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#3 posted 01-21-2017 12:58 AM


-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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#4 posted 01-21-2017 02:31 AM


It is difficult for me to tell whether the lighter spots are in the cast iron, but they appear to be on the surface and not in the cast iron. Since you used mineral spirits to clean the cast iron and the spots appear to lay on the surface, I wonder if you used the reduced odor mineral spirits and that left behind the spots (where the spots are additives put in home center sold mineral spirits). The other possibility is that the factory applied protective film was not completely removed.

If either is true and the spots are left-behind surface contaminates, then wiping the tables with an organic solvent free of additives like paint thinner, unadulterated mineral spirits, or even furniture paste wax devoid of silicones could remove the spots. I found that the product Sprayway 909 Orange Power Plus heavy duty degreaser in an aerosol spray can does a great job of removing cast iron protective films, leaving a contaminate-free surface. It is available from Grizzly and I would think it is another option for removing the spots.

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