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UV blocking for water based finish
http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=24364		 Page 1 of 1
Author:  Cecil [ Thu Oct 29, 2009 8:38 am ]
Post subject:  UV blocking for water based finish
I have a commission for an Osage Orange guitar and the customer wants to maintain the pale look of the freshly sawed wood. Without adding something to block the UV rays it will darken over time.

Anyone have any a source for UV blockers for use with water based finishes.

Cecil
Author:  Michael Dale Payne [ Thu Oct 29, 2009 9:04 am ]
Post subject:  Re: UV blocking for water based finish
The truth is that most of color change is caused by oxidation not UV fading. UV will yellow many finish films and fade the color of many woods but the darkening of Osage is not UV related it is oxidation happening.
Author:  Michael Dale Payne [ Thu Oct 29, 2009 3:37 pm ]
Post subject:  Re: UV blocking for water based finish
opps I did not mean to post again sorry [headinwall]
Author:  Cecil [ Thu Oct 29, 2009 4:51 pm ]
Post subject:  Re: UV blocking for water based finish
Thanks Michael,

I kinda thought that that was what was happening. My customer had talked to another luthier in the area and he told him that a UV blocker was need to prevent the color change.

This individual has retired from building after twenty years and just does repairs now. Goes to show you that twenty plus years is not enough to "learn it all".

Cecil
Author:  Michael Dale Payne [ Fri Oct 30, 2009 11:58 am ]
Post subject:  Re: UV blocking for water based finish
Cecil wrote:
Thanks Michael,

I kinda thought that that was what was happening. My customer had talked to another luthier in the area and he told him that a UV blocker was need to prevent the color change.

This individual has retired from building after twenty years and just does repairs now. Goes to show you that twenty plus years is not enough to "learn it all".

Cecil


Most modern instrument finishes already contain a UV inhibitor. By the way UV light can and does accelerate oxidation to a point but the long tem affect of UV exposure is to fade the color.
Because normally we do not seal the internals of a guitar. Even after finishing oxidation does occur. You could likely slow this way down by sealing the wood on the inside as well. This should slow down natural oxidation rate quite a bit. That said at any time the wood is in the green it is slowly but surely oxidizing.
Author:  mikemcnerney [ Sun Nov 01, 2009 7:11 am ]
Post subject:  Re: UV blocking for water based finish
In re. to your origianl question, someone recently told me that a UV blocker is simply pigment added to a finish. Does anyone out there know for sure & what kind & how much?
MM
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