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Message started by Bill_Errickson on Feb 16th, 2008 at 5:26am

Title: cyanoacrylate glue stain on mango soundhole
Post by Bill_Errickson on Feb 16th, 2008 at 5:26am
Hey All,  Does anyone have experience with  a stained mango uke soundboard with cyanoacrylate glue. The super glue bled away from the pua rosette into the wood pores. I tried sanding and scraping but it is deeper than can be erased. I tested a wash of amber waterborne shellac to see if it would blend in. It did not eliminate it entirely. I thought of tinting the sealer until the the stain became nuetral.  This mango too pretty for do-over!  Mahalo

Title: Re: cyanoacrylate glue stain on mango soundhole
Post by konacat on Feb 17th, 2008 at 9:56pm
That’s some tuff luck bud.  When you work with super glue you need to seal the area with shellac prior to using the super glue so it stays contained. I assume the CA was absorbed by the end grain and the stain goes pretty deep. You didn’t say how large the stain is or if it on the inside or outside of the rosette circle. I have used CA and titebond and I don’t think I will use CA for rosettes again. I sealed mine with shellac and had no problem controlling the CA. That being said, I know that titebond will not stain my top and I have heard numerous horror stories about the times the CA stained. I have some nice wood waiting to build with including some nice figured mango and I just don’t want to take a chance of having problems.

As far as the CA I know of no way to get rid of it. That being said, the only weakness of CA is acetone. What I don’t know is if straight acetone would harm or discolor the wood. Acetone is also contained in most fingernail polish remover. I’m not sure if that would be any better or worse than full strength acetone. Of course, if the CA soaked into the end grain there could be very deep which would make it even more difficult to remove. If you have some mango cutoffs you could try to recreate the problem and then try removing it to test the results of the acetone.

Of course I have a couple of thought of what you might be able to do.  Please understand that I have not tried any of the thoughts but I like to have outs.
If the stain is on the inside of the rosette the maybe you could carefully remove all the wood material up to the Paua. You could then either bind the area you removed or add a complementary/contrasting inner circle of wood. You can always add a sound hole patch or some veneer for bottom support.

If the stain is on the outside of the circle maybe you could add some decorative purfling around the rosette. Of course the stain may too big to cover with purfling. That would bring us back to adding additional complementary/contrasting wood outer circle.

If you need to go drastic you could remove the entire rosette area including the stain. You could then create a new rosette of your own design and drop the whole thing in place.  You can always use a piece of purfling between the sound board and new rosette to seat it tight.

The idea is to give you options to save your nice wood.  Any of this could be done if you proceed carefully.  A center piece can be made to fit inside your current sound hole so you can make new cuts from the center.  If you have the wood you could even segment it like an orange slice with purfling or paua. That would be a lot of work but it would look cool.

I have seen some creative and beautiful instruments that were the result of difficulties. Ultimately, it is still wood and challenges give you opportunities to be creative.  ;)


Title: Re: cyanoacrylate glue stain on mango soundhole
Post by konacat on Feb 18th, 2008 at 10:59am

I have not looked at ukuleles on Ebay in quite a while but looked today and found one you might want to look at. This ukulele has a rosette is bound on both side and shows no wood around the hole. The builder could have designed it that way but on the other hand he could have had a problem like yours and became creative. Anyway just happened to see it.


Title: Re: cyanoacrylate glue stain on mango soundhole
Post by Bill_Errickson on Feb 18th, 2008 at 11:45am
Thanks so much for your time and info konacat. I did try a test with acetone but I think the glue wicked through the sidewall of the inlay channel. It only projects at the max. 3/16" beyond the outside perimeter of the rosette, and only in a few spots.  All of your solutions would apply. This is the first time I've had an inlay bleed like this. I saw the link you had listed from E-Bay. I'm sure his wasn't an afterthought. You never stop learning things in the shop. At least I have many options. Appreciate your help. With Best Regards.  Bill

Title: Re: cyanoacrylate glue stain on mango soundhole
Post by lefty on Mar 30th, 2008 at 12:44pm

 I just read this post and was wondering what you did about the glue stain.

I had a similar problem on a uke top when I glued in a pau rosette.  Lucky for me I had put a wash coat of shellac on the top.  The glue wicked all the way through the redwood top.  If I hadn't placed a piece of wax paper under it prior to glueing I would now have a permanent uke top decoration on my work bench.  Lucky for me the inside of the top won't be visable without a mirror.   The glue was not a problem with the shellac coated outside face of the top.

 One thing you could do would be to apply CA glue to the entire top so it would have a consistant look.  Some people use the ca glue on their tops just to seal them.

Just some thoughts,

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