Official Luthiers Forum! :: View topic - accelerating dry time on a dent fix.

Okay,i`ve got it cooking.this whole scenario brings up another huge question.If this can be done on a small area,why not on the hole guitar.Maybe fans and some halogen lights could accelerate the whole nitro cure process.Any thoughts on that? And thanks again for a great tip.
James

Use a hair dyer placed about 20 inches away from the fill. I monitor the temp with a thermometer and it gets to about 115 - 120F, you should monitor yours if you do this I would not get it warmer than about 120 much above 130 and you'll more than likely bubble your lacquer. You can sand in about 8 hrs later or so.

Nelson,
I'm sure there is, just like in any drop fill. Obviously blowing hot air over a solvent doesn't really do anything except make it go away faster.
I was in a pickle and had to do this once and was able to see the guitar a year or so later and didn't notice the fill.
I probably had the hair dryer on it in multiple sessions for close to 40 hrs over the span of a week, it definately speeds it up a lot, but it's still nitro.

No one "needs" an accelerated repair. They want one. I learned to tell them that it takes as long as it takes to do it right. If that doesn't work for them, send them to someone else.

Howard Klepper wrote:

No one "needs" an accelerated repair. They want one. I learned to tell them that it takes as long as it takes to do it right. If that doesn't work for them, send them to someone else.

http://www.opentip.com/Apparel-Shoes-Jewelry/Ultraviolet-Led-Light-Source-Led-p-1503006.html
Here you go, Howard.
Awe, cmon you know you want one. laughing6-hehe

Author:	James W B [ Sat Jan 08, 2011 6:39 pm ]
Post subject:	accelerating dry time on a dent fix.
So someone needs a dent fixed in a week.Of course it`s nitro.It looks like it will drop fill okay,with 2 or 3 applications,but how can I level and buff it out in a week? Is there any possible way.Maybe run a pretty strong fan on it? James

Author:	Jim Watts [ Sat Jan 08, 2011 7:24 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
Use a hair dyer placed about 20 inches away from the fill. I monitor the temp with a thermometer and it gets to about 115 - 120F, you should monitor yours if you do this I would not get it warmer than about 120 much above 130 and you'll more than likely bubble your lacquer. You can sand in about 8 hrs later or so.

Author:	James W B [ Sat Jan 08, 2011 9:53 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
Jim are you saying ,that when the temp reaches 120 to turn the hair dryer off,or is there a certain amount of time that this temp should be maintained?This is good info. Thanks James

Author:	Jim Watts [ Sat Jan 08, 2011 11:01 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
No, let it blow on the area constantly blowing the 115 degree air or so over the fill. I think you'll be pleasantly surprised how well this works for a drop fill.

Author:	James W B [ Sat Jan 08, 2011 11:08 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
Jim when you say constantly.you mean like 8 hours or so. James

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Author:	Jim Watts [ Sat Jan 08, 2011 11:58 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
yes

Author:	James W B [ Sun Jan 09, 2011 9:22 am ]
Post subject:	Re: accelerating dry time on a dent fix.
Okay,i`ve got it cooking.this whole scenario brings up another huge question.If this can be done on a small area,why not on the hole guitar.Maybe fans and some halogen lights could accelerate the whole nitro cure process.Any thoughts on that? And thanks again for a great tip. James

Author:	Kent Chasson [ Sun Jan 09, 2011 2:46 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
James W B wrote: Okay,i`ve got it cooking.this whole scenario brings up another huge question.If this can be done on a small area,why not on the hole guitar.Maybe fans and some halogen lights could accelerate the whole nitro cure process.Any thoughts on that? And thanks again for a great tip. James There are a couple of problems doing that on an entire guitar. One is that if you heat the guitar while you're spraying, you can get bubbles when the lacquer skins over before most of the solvent has off-gassed. You would also need to do something drastic to control humidity. Bringing the heat up to 100 degrees or more would bring the humidity down fast. Other than that, it does speed up the cure. Furniture factories typically use curing ovens for their finishes.

Author:	James W B [ Sun Jan 09, 2011 4:23 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
Kent I`m sure there would be some problems.This is probablyly a whole different post.I`t is an interesting thought .I`m sure with all the intelligent people on this forum someone could possibly figure something out.The cure time on nitro to me is it`s biggest drawback. James

Author:	npalen [ Sun Jan 09, 2011 5:41 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
Jim Watts wrote: Use a hair dyer placed about 20 inches away from the fill. I monitor the temp with a thermometer and it gets to about 115 - 120F, you should monitor yours if you do this I would not get it warmer than about 120 much above 130 and you'll more than likely bubble your lacquer. You can sand in about 8 hrs later or so. Jim, would there be an issue with the dent showing up again after the lacquer cures and shrinks back in the dent area? Thanks Nelson

Author:	Jim Watts [ Sun Jan 09, 2011 7:39 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
Nelson, I'm sure there is, just like in any drop fill. Obviously blowing hot air over a solvent doesn't really do anything except make it go away faster. I was in a pickle and had to do this once and was able to see the guitar a year or so later and didn't notice the fill. I probably had the hair dryer on it in multiple sessions for close to 40 hrs over the span of a week, it definately speeds it up a lot, but it's still nitro.

Author:	npalen [ Mon Jan 10, 2011 12:17 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
Jim Watts wrote: Nelson, I'm sure there is, just like in any drop fill. Obviously blowing hot air over a solvent doesn't really do anything except make it go away faster. I was in a pickle and had to do this once and was able to see the guitar a year or so later and didn't notice the fill. I probably had the hair dryer on it in multiple sessions for close to 40 hrs over the span of a week, it definately speeds it up a lot, but it's still nitro. Jim, interesting stuff! There's times it would be nice to speed up the cure process on nitro drop fills. Will have to give it a try. (on scrap first of course) Nelson P.S. There's probably hair dryers out there that wouldn't last 40 hours.

Author:	James W B [ Mon Jan 10, 2011 1:03 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
It worked real well.I had the dryer on it for about 9 hours yesterday.This morning I leveled and buffed.It`s barely noticeable. James

Author:	Jim Watts [ Mon Jan 10, 2011 2:22 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
James, if you've got the time, put the hair dryer back on it and check for additional shrink back. repeat if necessary.

Author:	npalen [ Mon Jan 10, 2011 5:33 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
James and Jim and everyone else interested: With the risk of taking a simply elegant solution and making it complicated; I have to wonder if this would be a good application for a concentrated beam of infra-red? (Is there such a thing? Maybe think IR maglite ) Just thinking this might work in areas where one doesn't want to heat the surrounding area whether it be for reason of not softening glue, binding etc. Again, not wanting to derail an excellent discussion but hopefully expand on it. Thanks Nelson

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Author:	James W B [ Mon Jan 10, 2011 3:30 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
When I leveled I masked the area off and this left it a little high.I figure it will probably shrink a small amount.I`m real leary of sanding the surrounding area.I`ve done this before and had to re sand and buff the entire top instead of just the damaged area.If you think I still need to put the dryer on it ,I`ve got time. James

Author:	Jim Watts [ Tue Jan 11, 2011 1:27 am ]
Post subject:	Re: accelerating dry time on a dent fix.
Nelson, I would worry about getting the lacquer too hot and bubbling it . I don't know what the magic number is for that, although I don't believe it's terribly high. I suppose a rheostat should give you good controll of the temperature though. Also I think moving fresh air across it also helps with evaporation of the solvent, it's kind of a two fold thing. It certainly could be worthwhile to try on some scrap.

Author:	Howard Klepper [ Tue Jan 11, 2011 12:43 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
No one "needs" an accelerated repair. They want one. I learned to tell them that it takes as long as it takes to do it right. If that doesn't work for them, send them to someone else.

Author:	npalen [ Tue Jan 11, 2011 3:18 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
Howard Klepper wrote: No one "needs" an accelerated repair. They want one. I learned to tell them that it takes as long as it takes to do it right. If that doesn't work for them, send them to someone else. http://www.opentip.com/Apparel-Shoes-Jewelry/Ultraviolet-Led-Light-Source-Led-p-1503006.html Here you go, Howard. Awe, cmon you know you want one.

Author:	John Arnold [ Tue Jan 11, 2011 5:13 pm ]
Post subject:	Re: accelerating dry time on a dent fix.
If the dent is deep, you can fill most of it with CA, then top it with a few thin coats of nitro. I use a small fan at a low setting to speed the curing. In my experience, heat is too risky. Too much of a chance of bubbling the lacquer.

Author:	Howard Klepper [ Wed Jan 12, 2011 12:36 am ]
Post subject:	Re: accelerating dry time on a dent fix.
npalen wrote: Howard Klepper wrote: No one "needs" an accelerated repair. They want one. I learned to tell them that it takes as long as it takes to do it right. If that doesn't work for them, send them to someone else. http://www.opentip.com/Apparel-Shoes-Jewelry/Ultraviolet-Led-Light-Source-Led-p-1503006.html Here you go, Howard. Awe, cmon you know you want one. I like to laugh, Nelson, but this joke is eluding me.