Rough cast iron

Bossed

Bossed

Member
Hey all,
I've got some questions about epoxy primer on rough cast iron. Have some Farmall H wheels and hubs that were freshly sandblasted. I sprayed two coats of SPI Epoxy primer all over wheels and hubs to protect the raw metal. I won't paint them before the 7 day window runs out. The rims will be easy to scuff and reapply primer. I'm just not sure how to handle the hubs which have a rougher finish. Any tips or experience with this ? I would appreciate your thoughts.
 
To me its all old cast iron or new cast iron, since part of what keeps cast iron working so long is the oil that is penetrated into it is what does or does not allow the paints to stick well. Always have better luck with aged, new stuff, I try to cook a few times to see what seeps out.
 
anotheridiot said:
To me its all old cast iron or new cast iron, since part of what keeps cast iron working so long is the oil that is penetrated into it is what does or does not allow the paints to stick well. Always have better luck with aged, new stuff, I try to cook a few times to see what seeps out.
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Thanks for your reply. My concern is after the seven day window, epoxy primer will need to be scuffed. Wondering how you guys would scratch/scuff the rough cast iron.
 
crashtech said:
The answer is don't apply epoxy that far ahead of time on surfaces that are difficult to sand. If you can, apply another coat of epoxy before the 7 days is up.
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Well, I guess I should have thought or planned a little differently. I just knew the epoxy would protect it.
 
I don't know what they are called, but 3M makes an abrasive disk with "fingers" that are abrasive. These would probably do the trick.
 
On that rough cast iron surface, and after the window, I would lightly sandblast the epoxy before a slightly reduced sealer coat. A little finesse, back off on the distance, you can tell when you get a good even etch. May even go over with a grey scotchbrite after. This is my personal opinion, I've done it, flame suit on...
 
Slofut said:
On that rough cast iron surface, and after the window, I would lightly sandblast the epoxy before a slightly reduced sealer coat. A little finesse, back off on the distance, you can tell when you get a good even etch. May even go over with a grey scotchbrite after. This is my personal opinion, I've done it, flame suit on...
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No flame suit needed here brother. I appreciate you sharing your opinion/experience. ;)
 
I’ve done a lot of rough cast iron on some of my non automotive restoration work. I have Used a wire brush on the epoxy with good results, lean towards the softer bristled brushes. Any scotch rite or other abrasive like that leaves a nightmare of particles to try & clean off before moving to the next step.
 
Sellersrodshop said:
I’ve done a lot of rough cast iron on some of my non automotive restoration work. I have Used a wire brush on the epoxy with good results, lean towards the softer bristled brushes. Any scotch rite or other abrasive like that leaves a nightmare of particles to try & clean off before moving to the next step.
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Thanks for sharing. That's actually what I was thinking.
 
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