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I had a supply problem finding Deep Gold to spray the piano plates with. Video shows a fix by mixing powders.

-chris


Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
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I have mixed bronze powders in the past and they would separate when I sprayed them. I haven't tried it with Sheffield though.


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Hi Bill,
I addressed this issue in the video. Mel the owner of Sheffield explained to me that bronzing powders have to be dissolved in the solvent and made into a syrup before being mixed with the spray medium such as lacquer. Otherwise they stay as particles and will separate.

-chris


Chernobieff Piano Restorations
"Where Tone is Key"
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In your circumstance, what is the solvent?


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To add from the sideline perspective of a chemist who has worked some with dispersions and coatings:

To my best knowledge, the technical issue is not "dissolving", but wetting. The metal particles cannot dissolve in organic solvents. And a good thing this is too, because if they would dissolve, they would no longer appear as a metallic lustre, but as a coloured transparent solution, e.g. bluish or greenish (the colour of dissolved copper and its alloys).

So, while they must indeed remain particles (like any metallic finish), the issue is that they must be wetted thoroughly in order to disperse properly and to remain dispersed after spraying. If the two powders have different degrees of wettability, or different affinities for the specific solvent, that might well lead to separation, agglomeration, unevenness, etc.

Wetting can be achieved through choice of solvent, through high-shear mixing, through addition of wetting agents, etc.


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Thank you Mark for explaining that, makes sense.

William,
I am using Lacquer thinner to "Wet" the powder, then mixing in the solution into the Automotive lacquer(Duplicolor).

-chris


Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
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I wish they had made that clear on the can. I guess they assume that whoever uses this stuff KNOWS these things...yes?

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Just to clarify, my experience was not any test. Like you, I needed a different color than what I had. I mixed two random powders together and was surprised when they would not mix(I mix stains all the time). Maybe it was because they were two different brands. I don't know. I ended up spraying a red dye over the finish to get the color I was looking for. It actually came out very nice, but I was worried it would be impossible touch up if I ever needed to.


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