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| Can shellac be power buffed? http://luthiersforum.com/forum/viewtopic.php?f=10101&t=36886 |
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| Author: | meddlingfool [ Thu Jun 21, 2012 5:08 pm ] |
| Post subject: | Can shellac be power buffed? |
If so, how long does it need to cure before buffing? |
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| Author: | ballbanjos [ Thu Jun 21, 2012 5:36 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
I've power buffed shellac with a car-type buffer and really fine grit liquid polishes many times. A week or so has been fine. I personally wouldn't try it on a big buffer with aggressive cutting compounds. It melts at a pretty low temp, and I usually have a very thin coating to begin with. In my experience it would take a very very light touch. Dave |
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| Author: | JasonM [ Thu Jun 21, 2012 6:19 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
Yes, use my pedestal buffer with buffing compound, same as for nitro. Works great. |
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| Author: | JasonM [ Thu Jun 21, 2012 6:19 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
Yes, use my pedestal buffer with buffing compound, same as for nitro. Works great. |
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| Author: | meddlingfool [ Thu Jun 21, 2012 7:41 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
Awesome. Jason, how long do you leave it to cure, and how many coats do you spray Thanks |
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| Author: | JasonM [ Thu Jun 21, 2012 9:31 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
I french polish for a month or so, then rest it for a week before buffing. |
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| Author: | meddlingfool [ Thu Jun 21, 2012 11:45 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
Is there a reason that you don't spray it? |
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| Author: | Tai Fu [ Sun Jun 24, 2012 5:10 am ] |
| Post subject: | Re: Can shellac be power buffed? |
Shellac sprays terribly... it doesn't atomize quite right and you really have to strain the shellac before spraying because there are always lumps inside the shellac solution. I sprayed shellac on the Stella restoration because I don't want to take forever french polishing the stuff but I would spray for quick builds, then french polish them afterwards. I also hate cleaning shellac out of spray guns. |
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| Author: | bluescreek [ Sun Jun 24, 2012 6:22 am ] |
| Post subject: | Re: Can shellac be power buffed? |
shellac can be sprayed but you have to have the right tips and thinned properly. |
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| Author: | Trevor Gore [ Sun Jun 24, 2012 9:23 am ] |
| Post subject: | Re: Can shellac be power buffed? |
meddlingfool wrote: Post subject: Can shellac be power buffed? If so, how long does it need to cure before buffing? Hard shellac, applied with a fad, wait 10 days minimum, then cut and power buff. Attachment: Cedar-rosewd_s.jpg
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| Author: | CharlieT [ Sun Jun 24, 2012 9:26 am ] |
| Post subject: | Re: Can shellac be power buffed? |
Trevor Gore wrote: Hard shellac, applied with a fad, wait 10 days minimum, then cut and power buff.[/attachment] Looks nice, Trevor! What hard shellac do you use? |
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| Author: | Tai Fu [ Sun Jun 24, 2012 10:07 am ] |
| Post subject: | Re: Can shellac be power buffed? |
So exactly what is a "hard shellac"? Is it one of those U Beaut crosslinked shellac? Since I cannot get them (because its flammable liquid) how do I make them out of shellac flake? |
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| Author: | alan stassforth [ Sun Jun 24, 2012 10:29 am ] |
| Post subject: | Re: Can shellac be power buffed? |
Never buffed shellac, because I don't have a buffer  ,but I did spray it with no problems. I used a 1 lb cut, with an old Binks jamb gun, 35 psi, largest tip for the gun. It was a pleasure because it dried fast, and the fumes were not too bad. Took a month to cure for polishing. |
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| Author: | meddlingfool [ Sun Jun 24, 2012 12:07 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
Dewaxed shellac from flake was something I was able to spray nicely through the Rockler sprayer. I would like to try it as a complete finish. I can get uv poly done for a reasonable cost, and can do KTM-SV myself for a certain amount of effort, but they both seem to really change the resonance of the box audibly. With the U-bueat, are the crazing problems gone? It also seems horrendously expensive. Is shellac in general subject to crazing? Thanks |
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| Author: | Trevor Gore [ Sun Jun 24, 2012 6:53 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
CharlieT wrote: Looks nice, Trevor! What hard shellac do you use? I use the Shines stuff (probably not availably outside of Sydney), but Robert Rae of Shines is the guy who "invented" the stuff, which was then subsequently marketed by U-beaut. U-beaut initially removed the plasticizer but put it back in, apparently, after the crazing issues. There is also an additive that extends the wet edge time (for furniture makers) which Robert removes for me, because I'm looking for drying speed. Tai Fu wrote: So exactly what is a "hard shellac"? Is it one of those U Beaut crosslinked shellac? Since I cannot get them (because its flammable liquid) how do I make them out of shellac flake? Sorry, I don't know. However, I suspect the hardening additives are some fairly traditional mixture, e.g. sandarac and a mastic. There is nothing new! But, I could also be completely wrong. |
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| Author: | JasonM [ Sun Jun 24, 2012 9:44 pm ] |
| Post subject: | Re: Can shellac be power buffed? |
Is shellac in general subject to crazing? Thanks[/quote] Yes. where your forearm hangs over the top, the humidity in your skin will eventually craze it. Also if you try to put too much on in a session and dont wait long enough for it to cure between sessions it will craze. Its not particularly durable. |
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