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| Do you power wet-sand? http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=43664 |
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| Author: | Doug Balzer [ Tue Jun 17, 2014 10:49 pm ] |
| Post subject: | Do you power wet-sand? |
Do any of you use a RO sander for wet sanding nitro lacquer. I've always done this by hand, afraid of sanding through with a power tool. Am I wasting my time? |
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| Author: | meddlingfool [ Tue Jun 17, 2014 11:13 pm ] |
| Post subject: | Re: Do you power wet-sand? |
It can be done, but it sure mucks up a machine, particularly ones designed for vacuum as it will throw slurry into the workings... |
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| Author: | meddlingfool [ Tue Jun 17, 2014 11:14 pm ] |
| Post subject: | Re: Do you power wet-sand? |
If you want to power sand, you're better off going dry... |
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| Author: | RusRob [ Tue Jun 17, 2014 11:43 pm ] |
| Post subject: | Re: Do you power wet-sand? |
Nope, I hand sand everything. Especially when finishing, you are correct in being afraid of sanding through when wet sanding since the water acts as a lubricant keeping the sandpaper clear of dust and buildup that would normally reduce the cutting ability. The only way I could see using any kind of power sander is in a production situation where time is critical. I actually like hand sanding and enjoy the intimacy (if you can call it that) of being connected to what I am working on. Bob |
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| Author: | johnparchem [ Tue Jun 17, 2014 11:59 pm ] |
| Post subject: | Re: Do you power wet-sand? |
I have only done a couple of guitars with nitro I usually spray water based lacquer. I am a bit lazy when sanding finishes; I use a RO sander whenever I can. I sand dry. I have a vacuum attached to my sander so that grabs a lot of the dust. I start at 500 or 600 grit depending how many layers there are before the last time I leveled the finish. I do not use it on any corners or edges but I will even use it on the rims. I actually do a way better job with the ROS than I have ever done by hand. I pore fill with zpoxy and I do not spray any lacquer until the surface of the guitar is level. Once I did not have high and low spots on the guitar before spraying the finish I stopped sanding through the finish. |
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| Author: | Haans [ Wed Jun 18, 2014 6:39 am ] |
| Post subject: | Re: Do you power wet-sand? |
Yes, I use a pneumatic. You really can't use an electric RO. After filling and dying, enough finish is applied to level. then I sand with 600 grit and apply a second set of coats. If I have sanded through anywhere I apply a few extra coats in the area. Then I sand with 1000 grit and apply several thinned coats. I resand with 1000, 2000, 4000, and buff. I prefer my "dust" to be in the slurry I wipe off the instrument with a paper towel. |
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| Author: | B. Howard [ Wed Jun 18, 2014 7:15 am ] |
| Post subject: | Re: Do you power wet-sand? |
No. In fact I rarely wet sand on guitars at all these days, only on small finish repairs that will be rubbed out by hand. Other than that I dry sand my finish to prep for buffing. I use a buffing arbor and Menzerna compounds so I only need to sand out at 400 before I start the buffing. |
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| Author: | Josh H [ Wed Jun 18, 2014 8:15 am ] |
| Post subject: | Re: Do you power wet-sand? |
B. Howard wrote: No. In fact I rarely wet sand on guitars at all these days, only on small finish repairs that will be rubbed out by hand. Other than that I dry sand my finish to prep for buffing. I use a buffing arbor and Menzerna compounds so I only need to sand out at 400 before I start the buffing. Brian, which buffing compounds do you use to get from 400 to gloss? Thanks |
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| Author: | Tai Fu [ Wed Jun 18, 2014 11:10 am ] |
| Post subject: | Re: Do you power wet-sand? |
I have only seen production shops power sand a finish, but we're talking about Fender who uses 1/8" thick finishes that is impossible to sand through. There is no way I'm power sanding a finish, the amount of time it saves is miniscule to what you have to do to fix a sand through. |
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| Author: | Doug Balzer [ Wed Jun 18, 2014 2:00 pm ] |
| Post subject: | Re: Do you power wet-sand? |
Tai Fu wrote: I have only seen production shops power sand a finish, but we're talking about Fender who uses 1/8" thick finishes that is impossible to sand through. There is no way I'm power sanding a finish, the amount of time it saves is miniscule to what you have to do to fix a sand through. How does Fender build up to 1/8" with lacquer??... As that is what this thread is referring to. |
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| Author: | James Ringelspaugh [ Wed Jun 18, 2014 2:00 pm ] |
| Post subject: | Re: Do you power wet-sand? |
No. I tried using a ROS a couple of times and sanded through. |
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| Author: | uvh sam [ Wed Jun 18, 2014 5:21 pm ] |
| Post subject: | Re: Do you power wet-sand? |
I know a lot of factories do spray thick enough (.009-.0012") and use power sanders to level sand before buffing. I also have used a dynabrade 4" pneumatic for wet sanding and it is relatively safe if you have enough lacquer. Nowadays I shoot for a thinner finish so I like to wet sand with 600 grit and it doesn't seem to take too long to level sand. |
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| Author: | Tai Fu [ Wed Jun 18, 2014 8:54 pm ] |
| Post subject: | Re: Do you power wet-sand? |
Fender uses polyester/urethane. I've stripped one before and it takes quite a long time of very aggressive sanding to even get through the top coat. |
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