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| Nitro and synthetic rubber, unhappy marriage? http://luthiersforum.com/forum/viewtopic.php?f=10101&t=41265 |
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| Author: | RustySP [ Thu Aug 29, 2013 11:22 am ] |
| Post subject: | Nitro and synthetic rubber, unhappy marriage? |
I'm planning to build a small vacuum frame for a bridge glue-up. The 3/8" closed cell gasket I'm using is going to be cut from a sheet of what I was told is neoprene rubber for a seamless gasket. The soundboard will have a nitro lacquer finish on it. My question is there a problem with nitro and neoprene reaction? I've heard the stories about vinyl so I don't want to take a chance. I know there's folks out there that use vacuum and would really rather do that than go the C clamp route. Btw, I will be using hide glue and plan to clamp about an hour. Thanks Sent from my iPhone using Tapatalk 2 |
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| Author: | Rodger Knox [ Thu Aug 29, 2013 2:41 pm ] |
| Post subject: | Re: Nitro and synthetic rubber, unhappy marriage? |
I think you need to do a test on scrap, that's the best way to be sure. I think neopreme is OK with lacquer, but there's several flavors of each of these materials, so your best route is to test what you have. |
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| Author: | Stuart Gort [ Thu Aug 29, 2013 3:02 pm ] |
| Post subject: | Re: Nitro and synthetic rubber, unhappy marriage? |
Neoprene is the typical sponge rubber used on guitar stands so it's a fairly safe assumption you're ok. I can't imagine there would be a reaction without a solvent present. ...testing wouldn't hurt anything. |
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| Author: | Barry Daniels [ Thu Aug 29, 2013 3:08 pm ] |
| Post subject: | Re: Nitro and synthetic rubber, unhappy marriage? |
Since you will only have one hour of contact you should have no problems. The problem occurs when lacquer is in contact with the vinyl for days or weeks at a time. |
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| Author: | Rodger Knox [ Thu Aug 29, 2013 3:29 pm ] |
| Post subject: | Re: Nitro and synthetic rubber, unhappy marriage? |
With a new build and fresh lacquer, there will still be a small amount of solvent outgassing, and the contact time for reaction to occur will be at a minimum. I agree you're probably OK with an hour or two, but the risk of having to sand and refinish the top would induce me to do the test. 
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| Author: | Dave Fifield [ Thu Aug 29, 2013 3:45 pm ] |
| Post subject: | Re: Nitro and synthetic rubber, unhappy marriage? |
Make sure the lacquer is fully cured and rock hard before you vacuum-press glue the bridge on, otherwise the force of the vacuum will mark the finish where the seal touches it. DAMHIKT.... Dave F. |
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| Author: | RustySP [ Thu Aug 29, 2013 4:12 pm ] |
| Post subject: | Re: Nitro and synthetic rubber, unhappy marriage? |
Hey guys, Thanks much and I agree a test sample is a good idea. Dave - thanks, I hadn't thought of that. One more thing i overlooked is the membrane I got from Joewoodworker is polyurethane if I'm remembering right. I'll have to see how that will react with nitro, it looks a lot like vinyl. Hope it's ok, i sure do like vacuum. Sent from my iPhone using Tapatalk 2 |
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