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| One more Q on Zpoxy filling resin http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=23232 |
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| Author: | Corky Long [ Tue Jul 28, 2009 12:32 pm ] |
| Post subject: | One more Q on Zpoxy filling resin |
I've been experimenting with different pore fillers. Currently working with Zpoxy on a Koa 000 sized that I'm building. One thing that I've noticed is that it is much darker than the System 3 that I used last. It seems to make the Koa much darker (and darker than the Koa appears with a bit of Naptha on it. How careful do I have to be to make sure I sand it all back from the wood (and not the pores, of course)?? One note - I'm not using the Zpoxy on the top - just the back, sides and ncek. Is there ever an issue with a "blotchy look" if I am less than successful in uniformly sanding the porefiller back before finishing (with KTM 9 in this case.) Thanks. |
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| Author: | Arnt Rian [ Tue Jul 28, 2009 3:10 pm ] |
| Post subject: | Re: One more Q on Zpoxy filling resin |
Corky Long wrote: How careful do I have to be to make sure I sand it all back from the wood (and not the pores, of course)?? One note - I'm not using the Zpoxy on the top - just the back, sides and ncek. Is there ever an issue with a "blotchy look" if I am less than successful in uniformly sanding the porefiller back before finishing (with KTM 9 in this case.) Some people like to leave a layer of Zpoxy, or rather add a diluted layer of epoxy, after the pore filling is done. As you have noticed, Zpoxy has a yellowish hue, which is one reason this is done as some find it attractive. As an added bonus the epoxy will make the wood look "deeper", or give it a "wetter" look than almost any finish, at least more than waterborne finishes. I like to sand back to bare wood, and find that nitro or shellac gives much of the same wet look. And yes, there is definitely a danger that the wood will look blotchy if you don't sand uniformly back to bare wood. |
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| Author: | TonyFrancis [ Tue Jul 28, 2009 5:40 pm ] |
| Post subject: | Re: One more Q on Zpoxy filling resin |
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| Author: | Corky Long [ Thu Jul 30, 2009 9:09 am ] |
| Post subject: | Re: One more Q on Zpoxy filling resin |
Thanks for the replies - helpful. I like shellac, so how about this for a process. After completing prep work, and sanding down uniformly (220 fine enough?) Wipe with a coat of dewaxed shellac. Then, after dry, apply a thin coat of Zpoxy - let dry overnight, then sand back to the wood. Zpoxy again, sand back again. One more coat of shellac, then KTM 9. Unnecessarily complicated? My reasoning is that if I mistakenly cut through the shellac to the bare wood, the last shellac coat before the KTM 9 will give it a uniform appearance. One followon question. The Zpoxy finishing resin that I am using has a darker than "yellowish" tone to it - I"d describe it as almost a light cranbury color. I've been careful to mix it 50/50 with the hardener which is what gives it the color. Are we talkoing about the same stuff? |
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| Author: | Burton LeGeyt [ Thu Jul 30, 2009 9:19 am ] |
| Post subject: | Re: One more Q on Zpoxy filling resin |
Corky, Do a test to make sure that the z-poxy will stick/cure to shellac. I have not used z-poxy but I don't think the west systems I have been using will work over shellac. I have been thinking about doing the same thing you are proposing but with waterlox as the seal coat. I still have to make sure the westsystems will stick to that too. Whenever I sand back to bare wood I expose a pore or two and with any finish that sinks at all, it will eventually telegraph through. Not the end of the world, of course, but nice to able to avoid. |
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