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 Post subject: Surface/paintwork cracks
PostPosted: 28.06.2008, 01:25 
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Joined: 18.04.2007, 23:34
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Location: Essex UK
Hi
Is anyone as meticulous as me and looked at the surface of their instruments with a strong magnifier? I did this with a small hand held microscope approx (x20mag) and was surprised to find what appeared to be hairline cracks up and down the top half on one particular acrylic painted Yidaki, with more "cracks" toward the mouthpiece end, too many surely to be "proper hairlines" ? Most are invisible to the naked eye and the instrument does not leak air as far as I can tell, maybe it has always been like that and its just that I have now noticed . It has been oiled 3 times and has had a couple of coats of matt varnish applied to the outside as added protection and doesn't get played much so in theory it should be reasonably safe from cracks . Am I just looking at paint cracks caused by a bit of movement and has anyone else noticed anything similar with their instruments. Could it also just be the type of wood used in its construction as I know some timbers have a more open grain than others? The wood prior to oiling was quite red if that helps at all. I would post some pics but they would be too small to show I think.

Thanks guys
Paul

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 Post subject: Re: Surface/paintwork cracks
PostPosted: 28.06.2008, 04:18 
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acrylic paint that is watered down too much can look like mud cracks,maybe that is what you see.
I am guessing, don't know for sure .You could do a test on a plate of glass by pianting a number of test brush strokes on the glass with acrylic paint that is progressively diluted with water after each brush stroke.
:mrgreen:

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 Post subject: Re: Surface/paintwork cracks
PostPosted: 28.06.2008, 09:25 
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I have taken a macro picture of what I am talking about. It's not brilliant but if you look carefully, apart from the dark lines showing through the yellow ochre where the paint is thin there are numerous "cracks" in the paint. these are all over the top half of the instrument and all round the circumference,with some being quite long, you can follow them along with the scope.

Thanks


Attachments:
File comment: Paint cracks yidaki
paint cracks resize.JPG
paint cracks resize.JPG [ 196.23 KiB | Viewed 2825 times ]

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Last edited by ozmadman on 28.06.2008, 10:10, edited 1 time in total.
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 Post subject: Re: Surface/paintwork cracks
PostPosted: 28.06.2008, 09:39 
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Sorry for the large picture, wanted to give a good view of the "cracks"

bEST
pAUL

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 Post subject: Re: Surface/paintwork cracks
PostPosted: 28.06.2008, 09:42 
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I think you'll have to resize that picture Paul!

They look more like cracks in the paint created by shrinking as it dries. There are probably small cracks in the grain where the paint has been absorbed or perhaps the 3 oilings have penetrated the wood and made it swell slightly leading to the cracking. Sometimes certain varnishes will make acrylic paint crack too. As long as it's not leaking it doesn't much matter.


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 Post subject: Re: Surface/paintwork cracks
PostPosted: 28.06.2008, 10:11 
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thanks Kyle

Re-size stiil a bit big but a lot better!!

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 Post subject: Re: Surface/paintwork cracks
PostPosted: 28.06.2008, 20:19 
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Joined: 04.05.2008, 18:49
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Paul: I have a yellow arcrylic yidaki that has the exact same texture on the paint. They are more like cracks in the paint, and not in the wall of the stick. One thing I do to look for cracks is what I call the flashlight test. Take a small, but very powerful flashlight (like a maglight) and place it over the mouthpiece. The diameter of the lens should be just right so that it forms a seal over the mouth and no light leaks around the outside. You shine it down the bore while standing in a dark room. Any cracks will appear as thin bright lines running down the side of the stick. In case someone used glue to cover over cracks, light will still penetrate since PVA glue is somewhat translucent. This is why you need the brightest light you can find. It works best on the top third of the stick, but I suppose you could put something reflective under the bell, like white paper or a mirror, and this might help to extend the usefulness of the test down to the bell end.


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 Post subject: Re: Surface/paintwork cracks
PostPosted: 28.06.2008, 23:54 
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Interesting test! I doesn't leak as it plays too nicely it's just that I noticed. They are completely invisible to the naked eye so are not really a problem, I am just a bit meticulous / paranoid with things like this and I like to know my sticks inside out. Thanks

Paul

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 Post subject: Re: Surface/paintwork cracks
PostPosted: 01.07.2008, 18:49 
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im a painter, and that does look more like paint cracks than wood cracks.
just my 2 cents.

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 Post subject: Re: Surface/paintwork cracks
PostPosted: 02.07.2008, 00:42 
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Kind_Vapour wrote:
im a painter, and that does look more like paint cracks than wood cracks.
just my 2 cents.


Thanks, I reckon everyone's right, definately no leaks so I guess I will just have to stop fussing and being so particular!!!

Paul

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