Help! Witness lines in lacquer repair - FRETS.NET2024-03-29T02:05:25Zhttp://fretsnet.ning.com/forum/topics/help-witness-lines-in-lacquer-repair?commentId=2177249%3AComment%3A191494&x=1&feed=yes&xn_auth=notag:fretsnet.ning.com,2020-05-14:2177249:Comment:1914942020-05-14T10:49:43.588ZPeter Leveilleehttp://fretsnet.ning.com/profile/PeterLeveillee
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009326083?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009326083?profile=RESIZE_710x" class="align-full"/></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009326083?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009326083?profile=RESIZE_710x" class="align-full"/></a></p> tag:fretsnet.ning.com,2020-05-14:2177249:Comment:1916192020-05-14T10:49:17.608ZPeter Leveilleehttp://fretsnet.ning.com/profile/PeterLeveillee
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009320264?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009320264?profile=RESIZE_710x" class="align-full"/></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009320264?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009320264?profile=RESIZE_710x" class="align-full"/></a></p> tag:fretsnet.ning.com,2020-05-14:2177249:Comment:1913142020-05-14T10:48:55.507ZPeter Leveilleehttp://fretsnet.ning.com/profile/PeterLeveillee
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009314069?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009314069?profile=RESIZE_710x" class="align-full"/></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009314069?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009314069?profile=RESIZE_710x" class="align-full"/></a></p> tag:fretsnet.ning.com,2020-05-14:2177249:Comment:1913132020-05-14T10:48:32.065ZPeter Leveilleehttp://fretsnet.ning.com/profile/PeterLeveillee
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009307895?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009307895?profile=RESIZE_710x" class="align-full"/></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009307895?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009307895?profile=RESIZE_710x" class="align-full"/></a></p> tag:fretsnet.ning.com,2020-05-14:2177249:Comment:1916182020-05-14T10:47:57.189ZPeter Leveilleehttp://fretsnet.ning.com/profile/PeterLeveillee
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009293893?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009293893?profile=RESIZE_710x" class="align-full"/></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009293893?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009293893?profile=RESIZE_710x" class="align-full"/></a></p> tag:fretsnet.ning.com,2020-05-14:2177249:Comment:1913122020-05-14T10:47:27.561ZPeter Leveilleehttp://fretsnet.ning.com/profile/PeterLeveillee
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009286066?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009286066?profile=RESIZE_710x" class="align-full"/></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/5009286066?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009286066?profile=RESIZE_710x" class="align-full"/></a></p> I found this thread using Goo…tag:fretsnet.ning.com,2020-05-14:2177249:Comment:1914122020-05-14T10:44:48.812ZPeter Leveilleehttp://fretsnet.ning.com/profile/PeterLeveillee
<p>I found this thread using Google. I have been spraying nitro and doing touch ups for years and have never witnessed a witness line. Until a few days ago. On my Les Paul I was touching up the area over my filled screw hole. I had used my airbrush but apparently didn't thin it enough. I first tried using straight retarder on a cotton ball and as a guinea pig used the back of an acoustic which I had touched up last year. It did reduce the line but under shop light you can still see it. So I…</p>
<p>I found this thread using Google. I have been spraying nitro and doing touch ups for years and have never witnessed a witness line. Until a few days ago. On my Les Paul I was touching up the area over my filled screw hole. I had used my airbrush but apparently didn't thin it enough. I first tried using straight retarder on a cotton ball and as a guinea pig used the back of an acoustic which I had touched up last year. It did reduce the line but under shop light you can still see it. So I airbrushed straight retarder and the only evidence now is a raised area where the new lacquer had swelled from being rewetted. I will buff this in a few days. I noticed that looking at the witness line with a magnifying glass it is actually a line made by many tiny holes. Rewetting it apparently fills these holes.</p>
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<a href="https://storage.ning.com/topology/rest/1.0/file/get/5009266891?profile=original" target="_blank"><img src="https://storage.ning.com/topology/rest/1.0/file/get/5009266891?profile=RESIZE_710x" class="align-full"/></a> To follow up ... the retarder…tag:fretsnet.ning.com,2016-04-12:2177249:Comment:1581022016-04-12T18:40:53.093ZNate Scotthttp://fretsnet.ning.com/profile/NateScott
<p>To follow up ... the retarder overspray worked out with a bit of trial and error. The retarder melted into the new lacquer more easily that the old, and so it tended to gloss out the new part and made it look too new next to the old stuff. So, it took a few rounds of sanding/spraying/polishing to get a good even result with out the lines reappearing, and also getting the right gloss level. </p>
<p>To follow up ... the retarder overspray worked out with a bit of trial and error. The retarder melted into the new lacquer more easily that the old, and so it tended to gloss out the new part and made it look too new next to the old stuff. So, it took a few rounds of sanding/spraying/polishing to get a good even result with out the lines reappearing, and also getting the right gloss level. </p> Thanks to you both. I picked…tag:fretsnet.ning.com,2016-04-03:2177249:Comment:1578912016-04-03T00:32:48.029ZNate Scotthttp://fretsnet.ning.com/profile/NateScott
Thanks to you both. I picked up some retarder today and I will give that a shot first.
Thanks to you both. I picked up some retarder today and I will give that a shot first. Fun, isn't it. ;)
Hard to el…tag:fretsnet.ning.com,2016-04-01:2177249:Comment:1578012016-04-01T22:47:58.392ZDavid Collinshttp://fretsnet.ning.com/profile/DavidCollins
Fun, isn't it. ;)<br />
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Hard to eliminate these with touchups on old lacquer. A quick and easy trick that may help though -<br />
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When I can't get a full almagamation of old to new, and witness lines keep coming back in final buffing, I will often do a light misting of retarder (butyl cellosolve / ethylene glycol monobutyl ether) on the seams with no follow up sanding. Finish level sand as though you are about to rub out, very high grit paper (2000-2500), then go over with a very light misting of…
Fun, isn't it. ;)<br />
<br />
Hard to eliminate these with touchups on old lacquer. A quick and easy trick that may help though -<br />
<br />
When I can't get a full almagamation of old to new, and witness lines keep coming back in final buffing, I will often do a light misting of retarder (butyl cellosolve / ethylene glycol monobutyl ether) on the seams with no follow up sanding. Finish level sand as though you are about to rub out, very high grit paper (2000-2500), then go over with a very light misting of retarder.<br />
<br />
A day or two later, I will rub out with a compound like Meguiars #2 or Jescar polishing compound, rather than take it to the buffing wheel. With this approach I can often get the lines to finally disappear, but the blending really only occurs at that tiny feathered layer where they meet. Sand back or buff out too aggressively, and the lines can come back.<br />
<br />
Of course I will usually hit the original surface with retarder before spraying the touchup, and use a bit of retarder in the lacquer mix throughout the touchup process as well. In a pinch though, this top misting of retarder with no sanding or buffing afterward can help quite often.