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| Sanding lubricant - what’s best? http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10102&t=13283 |
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| Author: | wm17959 [ Sun Aug 19, 2007 12:42 am ] |
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I'm making solid-body electrics with a polyurithane finish that will have to be wet sanded and buffed. 7 years ago I worked for a short time at Lado Guitars in Lindsay and sanded a few guitars there. They used a light oil-bassed material as a lubricant instead of water, but I don't know what it was. It was a little like Kerosene, but lighter and less smelly. Any suggestions? |
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| Author: | Alain Desforges [ Sun Aug 19, 2007 12:52 am ] |
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Distilled water and a drop or two of dish soap. Change and clean bowl thoroughly in between each paper grit change... |
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| Author: | Mattia Valente [ Sun Aug 19, 2007 1:05 am ] |
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Mineral spirits works as well, if you're worried about swelling. I use the water and dish-soap method myself, just...very sparingly. You do NOT want water getting into any drilled holes. |
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| Author: | Dave Anderson [ Sun Aug 19, 2007 1:21 am ] |
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I use a little Murphys oil soap in water. |
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| Author: | David Collins [ Sun Aug 19, 2007 3:53 am ] |
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Understanding the purpose helps you make these decisions much easier. The liquid is used to carry away sanded debris and extend the life of the paper by keeping it from clogging. It's not there so much as a lubricant. Oil, water, mineral spirits, they all would do essentially the same thing. They each have their +'s and -'s. Water is cheap and available, but it swells wood and crack's the finish if it gets in to a screw hole or unfinished edge. Soap is often added to brake the surface tension of the water, so that it flows out on the finish and paper rather than forming little balls that roll off. This is all I've ever used, as I've seen no reason to move elsewhere. You just have to be careful around areas of bare wood. I had one or two cracking incidents in my first few guitars, and none in the few hundred since. Mineral spirits, naptha, kerosene, etc., won't swell wood, but they stink, they're messy, and and are extremely flammable. I certainly wouldn't be using these with an electric random orbital sander, unless it was an air one. Of course electric random orbitals don't care for water much either, but they won't cause an explosion. Most of these are relatively slow evaporating, but may also evaporate too quickly, defeating the purpose by leaving the debris behind that they were supposed to carry away. You can use non-water, non-flammable things like mineral oil, or any number of other oils. These won't swell wood, won't explode, and won't prematurely evaporate. They may stain the wood if they get in, and can be a real nuisance to clean up. If it weren't for the whole wood thing, a machine cutting oil would probably be perfect. Being a water-user with limited experience to the others, I may be missing some things here and only giving one side. So if there are any other spirit or oil users out here, please speak up. |
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| Author: | Billy T [ Sun Aug 19, 2007 4:53 am ] |
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Machine cutting oils are essentially water and oil combined with a detergent so they mix. There's no reason why mineral oil and dishwashing detergent together couldn't be used as a substitute. I've used just water, very sparingly, to avoid contact with unfinished sections. It doesn't require much. |
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