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| spraying in vacuum? http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10102&t=3004 |
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| Author: | Cocephus [ Sat Aug 27, 2005 12:45 am ] |
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I hope this doesn`t sound silly, but has anyone considered or tried spraying finishes in a vacuum chamber? I have an airtight room and got to thinking (oh no) about it. |
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| Author: | Mattia Valente [ Sat Aug 27, 2005 2:14 am ] |
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Um...not really. What precisely do you hope to gain/what problem you trying to solve? Seems like just getting set up (lock in, seperate air supply, actually getting enough pump power to create a real vacuum. |
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| Author: | Cocephus [ Sat Aug 27, 2005 3:22 am ] |
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I was thinking perhaps applying sealer coats and pore filling. Just in theory, if you were to spray a base coat, get out and seal off the room and apply vacuum to said room, would this not pull the sealer into the pores and possibly make a denser base coat? I`m not talking about any great amount of vacuum. Maybe a shop vac and a small room? Would a shop vac have enough "oomph" to pull atmospheric pressure down enough to make any difference? 
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| Author: | tippie53 [ Sat Aug 27, 2005 4:12 am ] |
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Actually your thinking is opposite of what would happen. The lower air pressure would pull gases out of the wood and when you went back to normal the gases would need to go back in and the sinks that would create would be scary. If you use a little heat you will get better results. The heat causes the gasses to expand. WHen you spray they will be pulled into the voids . This will help to fill the lows better. Also the engineering needed for the "vacuum room" is more than I think you realize. The amout of pressure that the room would have to take and if not built to withstand the load would colapse. The cost of a vacuum pump alone would make the project prohibative. A shop vac isn't strong enough. Food for thought john hall |
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| Author: | Cocephus [ Sat Aug 27, 2005 6:22 am ] |
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Yeah, maybe we should leave that stuff to the cryogenics experts!  The only time I want to see walls closing in is early spring.
Now, about this space/time continuum thing... |
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| Author: | old man [ Sat Aug 27, 2005 10:49 am ] |
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I think John is right on this. Unless the vacuum was directed just through the guitar, I don't think you would gain anything. Also creating a vacuum would demand a very tight enclosure or you will get a lot of dust pushed in from outside by the higher pressure. I think. Ron |
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| Author: | Jerry Hossom [ Sun Aug 28, 2005 1:54 am ] |
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Actually, vacuum is used when woods are stabilized with resins. It pulls the resin into the wood, and is what these people use. Stabilized Wood The result, however, is that I think your wood would go tone deaf. edited because my grammar sucks... |
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| Author: | Cocephus [ Mon Aug 29, 2005 1:16 am ] |
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You`re probably right, Jerry. Pulling the finish into the wood would make it more of a plastic than tone wood. As for tone deaf, you should hear my piano playing and singing at the same time! I`m only allowed to do this under strict quarantine.
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