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Poly finish

 
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weldaar



Joined: 15 Nov 2017
Posts: 5
Location: NJ

PostPosted: Thu Nov 16, 2017 6:16 am    Post subject: Poly finish Reply with quote

i would like to finish a guitar in Poly just for the durability. I want to put a color first. It cannot be a lacquer, I am guessing. What are my options? What do you recommend?
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Lon



Joined: 30 Dec 2003
Posts: 6086
Location: Stephenville, TX

PostPosted: Thu Nov 16, 2017 9:07 am    Post subject: Reply with quote

Any store bought polyurethane should work. There are pros and cons between oil based vs water borne poly.

What is your guess about lacquer?
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#313. Praisegig
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weldaar



Joined: 15 Nov 2017
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Location: NJ

PostPosted: Thu Nov 16, 2017 9:09 am    Post subject: Reply with quote

I have tried to cover lacquer color with Poly clear with not so good results.
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Lon



Joined: 30 Dec 2003
Posts: 6086
Location: Stephenville, TX

PostPosted: Thu Nov 16, 2017 12:30 pm    Post subject: Reply with quote

weldaar wrote:
I have tried to cover lacquer color with Poly clear with not so good results.


You can put lacquer over cured poly, but not poly over lacquer. Lacquer continues to gas off for a long time, which makes it impossible to cover with a solid clear like poly that doesn't let the gassing off to happen. This condition affects the adhesion of the poly, usually creates a mess to deal with.
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weldaar



Joined: 15 Nov 2017
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Location: NJ

PostPosted: Thu Nov 16, 2017 12:36 pm    Post subject: Reply with quote

I see. I would rather use the Lacquer. The problem I have with the Lacquer is that hangers and stands do not like it. How long must the Lacquer dry before you can hang the guitar? Also how long does Poly take to cure?
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marksound



Joined: 15 Aug 2005
Posts: 16668
Location: OKUSA

PostPosted: Thu Nov 16, 2017 12:42 pm    Post subject: Reply with quote

I've used Rustoleum clear poly over Krylon in the past. It was more of a meatball finish than anything, but it worked. Just make sure that your base color is thin and several days dry, scuff sand, and mist on the first few clear coats so the solvent doesn't eat into the color.

It's not optimal, but it will work.

Test on scrap.
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weldaar



Joined: 15 Nov 2017
Posts: 5
Location: NJ

PostPosted: Thu Nov 16, 2017 12:44 pm    Post subject: Reply with quote

I do like the Rustoleum clear and also their lacquers. I used them on my last build. How long before it actually hardens enough for hangers and stands? I like to put at least 6 or more clear coats.
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marksound



Joined: 15 Aug 2005
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Location: OKUSA

PostPosted: Thu Nov 16, 2017 12:54 pm    Post subject: Reply with quote

You'll need to baby it for a while. The thumbnail and sniff tests will give you an idea when it's safe to assemble.
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weldaar



Joined: 15 Nov 2017
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Location: NJ

PostPosted: Thu Nov 16, 2017 1:20 pm    Post subject: Reply with quote

Gotcha. So when the smell goes, it's ready assemble. I know that I rushed this last one. I wanted to play it.

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