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| Polyester finish http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=4067 |
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| Author: | Daniel M [ Sat Dec 10, 2005 8:40 pm ] |
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Several months ago I read a couple of very good articles on using polyester finish. Having just purchased a bunch of nitro, I decided to spend some time & money on a dedicated gun & a better spray booth & change over to polyester when the nitro was used up. Well... The time has almost come, & now I read that some folks are having some pretty serious problems with the polyester finishes. (I believe Mario recently wrote about adhesion problems he's been having) Has anyone got a handle on what is causing the problems? Are there specific woods that are problematic? Sealer / primer issues? How about catalyst quantity relative to temperature &/or humidity? I'd really like to switch to a process where pore filling & leveling is less of a chore, but I'm a bit reticent to give it a try if the finish is likely to peel off. I went through that with the early polyurethane aircraft finishes & don't feel the need revisit that disappointment. Any advice will be greatly appreciated. Thanks in advance, Daniel |
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| Author: | Mattia Valente [ Sat Dec 10, 2005 9:59 pm ] |
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I've only read positive things about polyester, mostly from Mario. All I've seen him state is that you really, really need to make sure you've sealed rosewoods off with a dedicated sealer (sold by the finish mnf) before spraying a finish. Other than that, it sounds like an almost ideal finish: hard, clear, cures very fast. It also sounds like a pretty 'picky' finish, especially compared to Nitro, which is a pretty forgiving finish, overall. |
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| Author: | Daniel M [ Mon Dec 12, 2005 3:45 am ] |
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Thanks for your reply Mattia; That was my impression too. After reading Mario's first set of posts on MIMF, I was convinced that it was worth the investment in setup & tooling. I was hoping Mario would jump in & give us an update... See if he has the bugs worked out. Guess I'll order some polyester & do some test sprays. Cheers, Daniel |
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| Author: | Mario [ Mon Dec 12, 2005 8:18 am ] |
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Been busy.... Yes, I have the bugs worked out. BEst advice I can give is RTFM. And don't try to out-smart the guys that made the stuff. When they say 'do this', do it, or else <bg> |
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| Author: | Daniel M [ Mon Dec 12, 2005 7:22 pm ] |
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Thanks Mario; As soon as I can find an FM, I will R it & follow like the proverbial lamb. I tend to get "clever" & cut corners... Usually it works out fine, but I'll resist temptation in this case. Dan'l |
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