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Yamha U3 polyester or polyurethane #2879896 08/15/19 12:12 PM
Joined: Oct 2005
Posts: 1
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AGiorgianni Offline OP
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Joined: Oct 2005
Posts: 1
Hello All

I have a Yamaha U3AR with a high-gloss finish that I purchased new in 1987, I think. (It's a 1987 serial number in the range of 4334800. Does anyone know if this is polyester or polyurethane? Or is there any way to tell?

Many thanks.
Anthony Giorgianni

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Re: Yamha U3 polyester or polyurethane [Re: AGiorgianni] #2879921 08/15/19 01:46 PM
Joined: Feb 2017
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P W Grey Offline
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Doubtlessly polyester. Virtually all high gloss pianos are polyester.

Pwg


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8
Re: Yamha U3 polyester or polyurethane [Re: AGiorgianni] #2879946 08/15/19 03:12 PM
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tunerman Offline
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All- Sometimes these were polyurethane with lacquer sprayed over and polished to high gloss. I learned this to my chagrin many years ago after a large in shop touch up when I burned through the lacquer to the polyurethane that will not take a polish. Had to respray the whole side and re-polish., So, if the finish reacts to lacquer thinner , which polyester won't, then it may be polyurethane underneath. Not sure of the dates of this transition, but the 80's are a good possibility.

YMMV

David Brown RPT
Garland TX

Last edited by tunerman; 08/15/19 03:19 PM.

David C. Brown RPT
Garland TX
Re: Yamha U3 polyester or polyurethane [Re: AGiorgianni] #2880017 08/15/19 07:34 PM
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P W Grey Offline
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Anthony,

Pray tell, why do you ask? Just wondering.

Pwg


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8
Re: Yamha U3 polyester or polyurethane [Re: AGiorgianni] #2880037 08/15/19 10:28 PM
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Pro-TAC Offline
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Yamaha has adopted all polyester paint since 1988.
U3AR...Some parts may be lacquered..(Side panel, arm ,toe rail.)
Upper panel end block, base molding=AS raisin or lacquered.
Toe block,leg,keybed =AS resin.
Other models have used UV coat for a while time。

Let's check before repairing.

If the sanding powder is,,
Bitter smell= polyester.
Sweet smell=AS resin.

Black=lacquer.
White gray=polyester.
Blue gray=AS resin.

See through a flashlight.
Purple=polyester.
Blue=AS resin.
Black=lacquer.

For your information.
https://photos.app.goo.gl/Y9b8EfqhXsBTJhRE6


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Pro-TAC tuning and repair service.
pro-tac.jpn.org/
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Re: Yamha U3 polyester or polyurethane [Re: AGiorgianni] #2880311 08/16/19 02:07 PM
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Rick_Parks Offline
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get s small can of lacquer thinner and test somewhere out of sight--- thinner won't remove polyester.
Polyester tends to look very thick and does not take a sharp edge well.

Are you refinishing? Repairing?


Parks and Sons Piano Service
www.parksandsonspiano.com

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