Reply by MrUnix

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Posted on Painting Cast Iron

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8244 posts in 3086 days

#1 posted 05-06-2017 12:13 AM

You plan on painting the whole jointer with one can of black spray paint?!?

Phosphoric acid will remove any remaining hidden bits of rust and prep the surface for good adhesion. You can get a gallon of the stuff pretty cheap at the BORG as you mentioned. Dilute 50/50 with distilled water, wipe it on, wait a minute or two, then wipe off. I then like to wipe everything down with mineral spirits just to remove any residual contaminates. Preparation is 99% of painting. And no, it’s not absolutely necessary – but you may wind up with a less than ideal paint situation down the road… like peeling paint, or paint that easily chips off when hit.

I also like to brush on the enamel, as it provides a thicker, more durable surface. Primer is not necessary.


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

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