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| What's wrong with my mahogany https://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=37550 |
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| Author: | oval soundhole [ Sat Aug 25, 2012 11:55 pm ] |
| Post subject: | What's wrong with my mahogany |
Well I was sanding the neck that goes with this body  and I noticed that on the endgrain areas, it looks like there are resins coming up or something. I've heard of something like this happening with spanish cedar, but is this something that also happens with mahogany on occasion? I pore filled with eggwhites and the finish is KTM-9. Does anyone know what happened and any ways to fix it (preferably without stripping the finish)  
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| Author: | bluescreek [ Sun Aug 26, 2012 8:36 am ] |
| Post subject: | Re: What's wrong with my mahogany |
I have seen this from using CA on Mahogany. If you have not used it possibly your supplier may have to stabilize a crack. CA will often run through the pores sealing the wood in that area making finishing difficult to hide the glue print. You can try using a toner to hide it In 12 years I have not ever seen this without a CA contamination . |
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| Author: | John Sonksen [ Sun Aug 26, 2012 10:34 am ] |
| Post subject: | Re: What's wrong with my mahogany |
This looks similar to what's happened to me using tung oil on mahogany. It's usually from a pore that soaks up more oil than what gets on the surface, and then it bleeds back out. I'd guess those spots didn't quite get filled all the way. |
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| Author: | B. Howard [ Sun Aug 26, 2012 5:12 pm ] |
| Post subject: | Re: What's wrong with my mahogany |
Looks like the extractive bleeding I've seen on lots of Spanish Cedar. What species of mahogany is it? How hot are you getting it while sanding? Could it be Spanish cedar, which is a true mahogany after all. If it is sap bleed a good cleaning with alcohol will usually remove it. |
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| Author: | Shaw [ Sun Aug 26, 2012 7:32 pm ] |
| Post subject: | Re: What's wrong with my mahogany |
I don't know but it looks to be happening in to many spots to be CA contamination unless they used it for multiple cracks and I don't see that. It may be the egg wash. Maybe a compatibility issue with the KTM-9 and egg whites. |
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| Author: | David Newton [ Sun Aug 26, 2012 7:35 pm ] |
| Post subject: | Re: What's wrong with my mahogany |
It looks like Spanish Cedar. |
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| Author: | oval soundhole [ Sun Aug 26, 2012 9:33 pm ] |
| Post subject: | Re: What's wrong with my mahogany |
I've worked with quite a bit of Spanish cedar and this is definitely not SC. The grain and pore structures are different and it didn't have the horrible smell/taste that SC has. |
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| Author: | oval soundhole [ Sun Aug 26, 2012 9:33 pm ] |
| Post subject: | Re: What's wrong with my mahogany |
BTW, I ended up stripping the finish and doing a refin on the neck. |
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| Author: | Steve Kinnaird [ Sun Aug 26, 2012 9:45 pm ] |
| Post subject: | Re: What's wrong with my mahogany |
And now our curiosity is aroused! Pics please. And report--how did it turn out? Way to hang in there, Steve |
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| Author: | oval soundhole [ Sun Aug 26, 2012 10:18 pm ] |
| Post subject: | Re: What's wrong with my mahogany |
Steve Kinnaird wrote: And now our curiosity is aroused! Pics please. And report--how did it turn out? Way to hang in there, Steve I have about 10 coats of KTM-9 on it and so far it looks good: I'll post some pics after it dries. I'm really hoping it works out. |
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| Author: | Tony_in_NYC [ Mon Aug 27, 2012 8:14 am ] |
| Post subject: | Re: What's wrong with my mahogany |
It looks to me like that mahogany is sad and it's just crying a little. Maybe take it outside to play a bit and it will cheer up and stop crying. ![[:Y:]](./images/smilies/smiley20.gif "Thumbs Up")
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| Author: | forgottenwoods [ Mon Aug 27, 2012 10:16 am ] |
| Post subject: | Re: What's wrong with my mahogany |
This problem is likely from mahogany harvested from young immature trees. Probably sourced from plantation grown trees that are less than 30 years old. |
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| Author: | Mike OMelia [ Mon Aug 27, 2012 11:03 am ] |
| Post subject: | Re: What's wrong with my mahogany |
oval soundhole wrote: I've worked with quite a bit of Spanish cedar and this is definitely not SC. The grain and pore structures are different and it didn't have the horrible smell/taste that SC has. Hey! SC smells awesome!  I would not make a neck out it because of that tendency to make sap. But you would know if was because of that wonderful scent!  Did you use any oils on it? Mike |
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| Author: | oval soundhole [ Wed Aug 29, 2012 12:55 am ] |
| Post subject: | Re: What's wrong with my mahogany |
I simply refinished the areas that had the problem and blended the new and old finished: it worked well  
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| Author: | bluescreek [ Wed Aug 29, 2012 5:45 am ] |
| Post subject: | Re: What's wrong with my mahogany |
look much better |
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| Author: | Tony_in_NYC [ Wed Aug 29, 2012 7:08 am ] |
| Post subject: | What's wrong with my mahogany |
Nice job. |
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| Author: | SteveSmith [ Wed Aug 29, 2012 7:16 am ] |
| Post subject: | Re: What's wrong with my mahogany |
well done. |
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