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| Discoloration of Martin Finish - How to Fix? http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10137&t=54649 |
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| Author: | puffmogan [ Thu Dec 23, 2021 2:42 pm ] |
| Post subject: | Discoloration of Martin Finish - How to Fix? |
I re-glued the binding and held it on for a few days with Blue Painter's Tape. The finish is now discolored as in the photo. I believe it's satin nitro. I have cleaned the surface and the discoloration remains. I think I can detect a slight smoothing of the finish where the discoloration is. Recommendations on how to fix? Attachment: 11809 (1).jpg
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| Author: | Colin North [ Thu Dec 23, 2021 3:15 pm ] |
| Post subject: | Re: Discoloration of Martin Finish - How to Fix? |
Did you clean with naphtha? |
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| Author: | puffmogan [ Thu Dec 23, 2021 6:08 pm ] |
| Post subject: | Re: Discoloration of Martin Finish - How to Fix? |
Thank you for your suggestion. I cleaned with naptha and the marks are still there. I can find no trace of any substance on the surface. |
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| Author: | bobgramann [ Thu Dec 23, 2021 6:39 pm ] |
| Post subject: | Re: Discoloration of Martin Finish - How to Fix? |
The adhesive in the 3M blue tape has an ingredient that dissolves nitro lacquer. There’s a warning in very small print inside the core. You may have some finish repair ahead of you. |
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| Author: | johnparchem [ Thu Dec 23, 2021 7:10 pm ] |
| Post subject: | Re: Discoloration of Martin Finish - How to Fix? |
bobgramann wrote: The adhesive in the 3M blue tape has an ingredient that dissolves nitro lacquer. There’s a warning in very small print inside the core. You may have some finish repair ahead of you. Just today Alan Carruth posted nearly an essay on how reactive nitrocellulose is in the classical guitar forum, and how many products react to it. It is worth a read. |
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| Author: | Barry Daniels [ Fri Dec 24, 2021 9:52 am ] |
| Post subject: | Re: Discoloration of Martin Finish - How to Fix? |
I did the same thing about 10 years ago before I knew of the hazards of this tape. I was able to polish it out with my buffer. |
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| Author: | Colin North [ Fri Dec 24, 2021 3:38 pm ] |
| Post subject: | Re: Discoloration of Martin Finish - How to Fix? |
Barry Daniels wrote: I did the same thing about 10 years ago before I knew of the hazards of this tape. I was able to polish it out with my buffer. I believe buffing will polish up satin nitro and change the sheen. |
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| Author: | Barry Daniels [ Fri Dec 24, 2021 3:41 pm ] |
| Post subject: | Re: Discoloration of Martin Finish - How to Fix? |
Colin North wrote: Barry Daniels wrote: I did the same thing about 10 years ago before I knew of the hazards of this tape. I was able to polish it out with my buffer. I believe buffing will polish up satin nitro and change the sheen. Not necessarily. Most factory satin finishes are achieved by using flattening agent in the finish and polishing this will not change it from satin. |
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