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coach
PostPosted: Tue Jan 22, 2013 6:18 pm 
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This may be a silly question, but I have a couple of aerosol cans of color tone spray lacquer colors that I was planning on trying a sunburst finish with, when I started to wonder...can you spray a water based lacquer over this?

The cans are nitro based from stewmac, and my finish is Ktm 9.

Thx for the feedback in advance.

Sean

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Joe Beaver
PostPosted: Wed Jan 23, 2013 7:49 pm 
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Since no one seems to have an answer, let me try.

I'd test on a scrap first. Spray the colored nitro, let it dry until no more off gas odor (probably a week or two. Next I would spray half the sample with a de-waxed shellac like zinsser primer sealer. Let that dry and then coat both pieces with the waterbased. I'd bet the shellaced piece will work fine.

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coach
PostPosted: Thu Jan 24, 2013 6:08 am 
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Thx Joe,

I'll try that.

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Joe Beaver
PostPosted: Thu Jan 24, 2013 8:07 pm 
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As I suspected, the nitro guys have an aversion to anything waterbased. beehive Someday perhaps a finish will come along that will set them free bliss

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B. Howard
PostPosted: Thu Jan 24, 2013 8:59 pm 
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Joe Beaver wrote:
As I suspected, the nitro guys have an aversion to anything waterbased. beehive Someday perhaps a finish will come along that will set them free bliss


Not really so, I have tried a lot of different finishes. Haven't found any that do better than Nitro or FP for guitars. Floors, cabinets, furniture, boats..........are far different items with different needs. I just have no idea if you can run a particular urethane over nitro. For a new finish I would choose one system and use it the whole way through. Adhesion and film bond problems may take a while to manifest, it may fog or peel. The lacquer will still be trying to outgas under the other coating.

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coach
PostPosted: Thu Jan 24, 2013 9:35 pm 
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That's a good point, Brian. I think I will stay with one, water based, and just spend some more money on some dye I can spray with my hvlp gun. I'm getting nervous about using cans anyway. There's no control.

Thanks to both of you for replying.

Sean

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