I took a bunch of these
and made them into these
But the wife thinks they should be more polished like this
Which would be more correct for the era?
Where will these little carriage bolts go?
Are they brass?
The highly polished won't take paint as well, and the paint can chip off. Leave the machined finish or grinding finish on to provide bite for the primer and paint.
Keith,no they are not brass some of them will go to the running boards and fenders but most will be used for the 26 Buick almost everything on that car has modern hex bolts so I am putting these where needed, and I'll have a couple of extras to replace the ones I loose
That's what I was thinking Dan.
If they really show and you think the grinding marks will show though the paint, make them smooth and bead blast before painting.
Are they zinc plated? After I take of the markings, I always "wash" my zinc plate bolts with muriatic acid, then neutralize them with baking soda and water. Dry them off immediately and prime and/or paint them.
Does the '26 Buick use square nuts with carriage bolts, like on the Model T?
I do the same as Keith to remove the plating, then I prep the pieces with DuPont 5717-S. It contains phosphoric acid that etches the surface so paint will stick, and acts to prevent rust. You've removed the plating where you ground off the markings, but any that's left elsewhere will shed paint if you don't get rid of it.
Coca Cola and pretty much all soda contains phosphoric acid too. We used it where I used to work to de-black stainless after welding it. It etches steel and with a little electric current applied makes stainless silver again, what does it do in soda pop?