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| Crack! http://luthiersforum.com/forum/viewtopic.php?f=10137&t=48403 |
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| Author: | BradGranath [ Thu Oct 13, 2016 10:37 pm ] |
| Post subject: | Crack! |
Pix: https://goo.gl/photos/vXazf1Xs2jj5zGq78 I picked this up at the Goodwill for $8. Took off the poly finish and sealer. May have scorched it a little with the heat gun. What should I do about the crack where the bass wing is splitting away from the guitar? |
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| Author: | Hesh [ Fri Oct 14, 2016 6:36 am ] |
| Post subject: | Re: Crack! |
Dan Erlewine of Stew Mac has an excellent book on guitar finishing. In the book he talks about using Bondo for cracks on solid body electrics that will be painted. The crack should be secured first, likely use epoxy, quality structural epoxy and sound woodworking, gluing, and clamping methods and then fill as necessary and finish. The book is a good idea though if you're interested in this stuff and Dan's advice is as good as it gets. Welcome Bradford to the OLF! |
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| Author: | BradGranath [ Fri Oct 14, 2016 1:39 pm ] |
| Post subject: | Re: Crack! |
Thanks for the book recommend, Hesh. My local library has a copy on the shelf right now so I will certainly pick that up. I'm worried that the clamping force necessary to close the crack will put too much stress on the rest of the body. |
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| Author: | Hesh [ Fri Oct 14, 2016 3:43 pm ] |
| Post subject: | Re: Crack! |
BradGranath wrote: Thanks for the book recommend, Hesh. My local library has a copy on the shelf right now so I will certainly pick that up. I'm worried that the clamping force necessary to close the crack will put too much stress on the rest of the body. Got ya, I'd consider filling the crack with structural epoxy and then after that's cured smoothing things out if any remaining cosmetic imperfections exist with bondo. That's what Dan E. describes in his book. Some cracks even on acoustics if they have been open for a long time should not be forced closed and instead filled usually with wood. Good call on your part about being concerned about forcing it shut. |
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| Author: | BradGranath [ Fri Oct 14, 2016 10:16 pm ] |
| Post subject: | Re: Crack! |
I'm thinking I'll steam it lightly, inject a lot of hot hide glue (could inject epoxy, but is it viscous enough to penetrate?), and then clamp as lightly as possible. Clean up. Scrape flat. Is the bondo really necessary? I'm planning on rattlecanning 3 coats of white auto primer, 2 solid color coats, 3 coats of clear, sand, 2 more clear coats with sanding and polishing. With ten coats of paint is anyone gonna notice the lack of bondo? EDIT: Thumbing through Guitar Player Repair Guide by Mr. Erlewine. This snazzy 3rd edition with DVD the library had has a strat on the cover, but this book does not have any guidance for solidbody electric instrument repair. But it does have a chapter on electronics?? Frustrations aside, this book is fantastic. |
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| Author: | Hesh [ Sat Oct 15, 2016 5:04 am ] |
| Post subject: | Re: Crack! |
HHG is only a good choice when the joint is decent, it's not a gap filler. I can't tell from the photo if the crack is open or not. Bondo is only one possibility if you have imperfections to fill. If not you don't need any filler of course. I haven't seen the latest edition(s) for ten years now so I can't comment. |
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| Author: | Ruby50 [ Sun Oct 16, 2016 8:43 am ] |
| Post subject: | Re: Crack! |
To get the epoxy to penetrate you can do any or all of these things: Heat the area with a hair dryer Heat the mixed epoxy with a hair dryer Use a soda straw directed at the joint to blow the epoxy in Use a thin piece - think feeler gauge - to slowly work the material down into the joint The piece is probably now stable after it has cracked, so you are as much filling the crack as gluing it together Ed |
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| Author: | BradGranath [ Mon Oct 17, 2016 1:19 pm ] |
| Post subject: | Re: Crack! |
Couple of better pictures: https://goo.gl/photos/vXazf1Xs2jj5zGq78 OK, heat it, heat the epoxy, inject, clamp. |
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