What do most people do about protecting bare metal parts that are later body painted? Two examples are the C1 trunk towers and the big triangular softtop reinforcements on the bulkhead. I notice the trunk towers were plated in either zinc or cad and then oversprayed with interior paint. A lot of that has rusted off mine. The softtop reinforcements seem to have been raw metal that were likewise primed and painted with the bulkhead. I was thinking of zinc plating them since I don't know exactly how I will have them painted later... if not that priming them with the green zinc self-etching primer readily available. Thoughts?
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Re: prime or plate metal parts that are later painted?
If you are going to paint use self etching primer first so the paint sticks -
Re: prime or plate metal parts that are later painted?
I use Captain Lee's Metal Prep & Conditioner on bare metal if it's going to wait for paint. I get it at my local Body Shop Supply, but here's a link for more info.
RichComment
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Re: prime or plate metal parts that are later painted?
thanks. So it leaves a little zinc on it to inhibit rust. pretty cool.Comment
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Re: prime or plate metal parts that are later painted?
Yes a zinc phosphate. I use it on complete frames too using a plastic spray bottle or brush. You can prime/paint right over it.
They don't recommend it, but I also use it diluted in a container to remove rust from small parts. Many years ago restoring the wifes Jag, she went to the paint shop to pickup some supplies for me and the counter guy sold her a gallon for small parts rust removal. It was a Dupont product then IIRC. Mixed up with some water in a 2 gallon plastic bucket, it worked great for removing rust from small parts. But you can't leave it in too long as it aggressively eats the steel. Found out the hard way when I forgot about a few pieces. A few days later I remembered, and the parts lost about 10% of thier material.
Recently restored some C1 seat tracks and works great to clean up the rollers and saddles.
P2160005.jpg P2190025.jpg P2190028.jpg
After cleaning and prep, I also use it for small parts before going to the cad/zinc plater to keep them from rusting before plating. Their cleaning bath removes it before the plating actions.
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RichComment
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Re: prime or plate metal parts that are later painted?
Rich,
Nice work!! Do you know if Dupont still sells this stuff or what would be comparable in todays market?Leif
'67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
Top Flight 2017 Lone Star RegionalComment
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Re: prime or plate metal parts that are later painted?
Don't know if Dupont still markets it, but the Cap'n Lee's is what I get locally. Same stuff.
RichComment
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Re: prime or plate metal parts that are later painted?
thanks, Rich...I'll try that.Leif
'67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
Top Flight 2017 Lone Star RegionalComment
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Re: prime or plate metal parts that are later painted?
I will definitely look at it for prepping stuff for paint. but it would cause an issue with cad plating right? Since it coats in zinc?
I like this stuff for rust removal, since it is chelating - converts to black and not acidic (no risk unless the part is maybe a lot of oxide in the metal?). I've left parts in it for long periods without any problem unless they were originally coated in black since there would be more oxide in them (if I understand correctly). http://www.evaporust.com/Comment
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Re: prime or plate metal parts that are later painted?
Ian, Thanks for the Evaporust link. Looks good.
The Metal Prep is fine for Cad plating, as the Cad plater immerses all parts in a cleaning bath before plating. I verified this with my Cad plater before using it.
RichComment
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Re: prime or plate metal parts that are later painted?
OK cool, that was my primary concern on it. I plan to cad plate most of my hardware not explicitly supposed to be black or zinc.Comment
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