Ich poste hier jetzt mal einen langen Beitrag, den Terry McInturff (
TCM Guitars) verfasst hat - da ich den sehr gut finde.
Ist zwar in Englisch, aber ihr könnt den zur Not auch per Google übersetzen lassen - ich belasse es beim Original, um da nicht versehentlich irgendeine seiner Aussagen zu verfälschen (und ausnahmsweise aufgrund der Länge nicht in kursiver Schrift, damit es besser lesbar ist).
Ich bin mir ziemlich sicher, dass manche von euch beim ein oder anderen Punkt widersprechen werden - so wie immer halt, wenn sich Experten streiten...
Aber vielleicht könnt ihr trotzdem was damit anfangen.
"Hello all,
I've been involved with guitars full-time for approaching 43 years and have been involved with well over 50,000 stringed instruments in my roles involving repair/restoration, large-volume guitar manufacturing, and in the building of TCM (McInturff) guitars.
Time-and-again, the subject of fretboard oiling comes up, and so I'd like to take a few minutes to share with you the lessons that I've learned about fretboard oiling. There seems to be quite a bit of mis-information out there; hopefully we can clear that up via this post.
Kindly read the entire post for 100% of the information that you deserve!
1) Good reasons for (correctly and rarely) oiling a fretboard
A. After a period of time...if the guitar is being used as intended...there will be a build-up of congealed human skin oil and dead human skin cells on the fretboard that are unsightly to many. There is a procedure regarding how to clean a fretboard of these things, and oiling (correctly and rarely) is the final step. I will not describe that cleaning procedure at this time, but it is a stepwise procedure that has oiling (correctly and rarely) as it's "finale' ".
B. If the guitar has been stored unplayed for quite a long time, the copper content of the so-called "18% Nickel Silver" fretwire begins to dull and then to turn green. This will happen to a virtually unplayed guitar but any trace of human skin oil/acids will accelerate the discoloration (Stainless Steel fretwire is resistant to this phenomenon).
In this case, an abbreviated fretboard cleaning procedure is understandable and again, oiling (correctly) is the last step.
C. A desire to darken the color of the fretboard wood. This is a one-time procedure, kindly continue reading this post for more information.
2) The Bad Reasons for oiling a fretboard
A. "Preventing cracking of the fretboard"
Fretboards dry out, change dimensionally (shrink), and sometimes crack due to the loss of
water vapor, i.e., water in it's gaseous state. Read on.
Fretboards made of the various members (approx 250 strong) of the Rosewood family of woods are typically loaded with natural resins; these woods (if of true musical instrument quality) are not prone to cracking...but they can. The Ebonies are far more prone to cracking due to loss of H2O vapor.
And an unfinished Maple fretboard, although it is hard, almost welcomes
water vapor exchange with the atmosphere, despite it's density/hardness (these properties involve the structure of the cell wall).
It is a common misconception that a fretboard oil will prevent cracking, or dimensional change due to the loss of H2O vapor;
this is incorrect.
Unless you plan to coat the fretboard with something like a thick layer of Cosmoline (which I trust that you will not do) there's no appropriate oil that presents much of any barrier to the exchange of H2O vapor.
Water molecules, when in gaseous form (H2O vapor) are in a highly excited state compared to water in it's liquid or solid form. The active H2O
vapor molecules rather easily "shoulder their way past" any of the common oil molecules.
Many have mentioned that the "bore oil" formulated for woodwind instruments has been used for generations in order to prevent the cracking of these instruments. And...used properly this does help to preserve the integrity of a woodwind instrument!
*But "bore oil" does not prevent fretboard cracking/dimensional change on a guitar*
Why..and why not?
It's because the interior of a woodwind instrument is exposed to extremely high humidity when it is played; we all know that human breath is of high moisture content (breathe on a glass to see).
This moisture in human breath condenses into
liquid water inside of the instrument...a very different situation than a guitar fretboard.
Bore oils and other oils do a great job at slowing the absorption of
liquid water by the wood.
But they are no better than any other such oil at preventing the exchange of
water vapor.
The repelling of liquid water via "bore oil" inside a woodwind instrument is of true value.
But it will not prevent your Clarinet from cracking if it's allowed to lose too much H2O content (vapor).
Here we see the difference between what I call "free water" (that which is trapped within the cell walls, and which is the first to come and go) and "bound water" (that which infiltrates the cell wall and which is slower to come-and-go)
B. "Re-hydrating a dry fretboard"
This is a common, and understandable, misconception.
As I've explained, fretboards dry-out, change dimensionally, and can sometimes crack due the loss of
water vapor.
No fretboard oil will replace lost water vapor. There is negligible water vapor in oil. And it is the loss of water vapor that results in fretboard dimensional change (shrinking, "fret sprout", forward bowing of the neck) and sometimes cracking (particularly with the Ebonies).
Oils give the visual impression of "re-hydration", but that is all. At the microscopic level it can be seen that
copious oiling can in time change the shape of the cell walls and the relationship between neighboring cells (species-dependent, oil dependent) but by that time all we see at the microscopic level is a weakening of the structure of the wood. In other words,
damage.
Which leads to:
3) How (improperly) oiling a guitar's fretboard can cause damage
When a fretboard is oiled, it is not possible to prevent that oil from seeping-under the fret.
Especially when using a non-drying oil, this can result in an accumulation of oil under the fret which causes
true harm to the guitar.
Here's how:
- Can soften the wood in the vital fret slot region (non-microbial "rot")
- Can provide a microbial environment (oil/substance-dependent), encouraging microbial activity that will actually digest the wood under the fret (microbial "rot")
- Can lessen the fret's "grip" on the wood....frets can pop-up causing buzzing/dead spots
- Can complicate refretting; the wood is infiltrated with oil and fret replacement is compromised/more difficult
Over-oiling a fretboard constitutes abuse of the instrument.
4) What oil is safe to use?
There are a number of products that are safe to use, but always test for yourself!
What they all have in common is that they all dry...they do not stay liquid. Here at TCM I use the commonly available "Watco Danish Oil"....sparingly. And you can darken the wood a bit via on of the darker shades of Watco.
5) How do I know if an oil is safe to use on my fretboard?
Wipe a streak of the oil on a pane of glass. If after 3 days it's not hard...or clearly getting hard....use it for something else, or dispose of it. Do NOT use any oil on your fretboard that "stays wet". Ever. If you've been doing-so, stop now for the health of your guitar.
For reasons explained above,
any oil that does not dry, which stays wet, is an enemy of the integrity of your guitar. Repeated use of such constitutes harming your guitar.
6) How often is it safe to oil my fretboard?
Once every year is okay, if you
go light and don't soak it on.
7) I enjoy cleaning my fretboard and playing on a nice, clean surface. Anything that I can do besides oiling that's safe for my guitar, and looks good/feels good?
Regular use constitutes the best care! The wood and frets will become burnished and smooth via regular use. But if you have a stable of guitars, some will get more playing-time than others.
Keeping in mind that NOTHING should be applied to your fretboard heavily....no "soaking" etc...Johnson's Paste Wax is safe. Be artistic in application...a thin film that's allowed to dry, followed by buffing with a soft cloth. I'm OK with somebody doing that every 100 hours of playing time.
8) If the main-aim is to prevent the fretboard from losing/taking-on water vapor, and oils cannot prevent this effectively, what do I do to prevent excessive drying/shrinking...even cracking? Or...getting too wet/swelling?
Store the guitar in an environment that doesn't encourage drying-out.
-Case humidifiers
-Your home's HVAC settings
-Etc
Remember, it is all about preventing your fretboard from experiencing extended swings in the ambient environment. Your fretboard will experience swings in it's moisture content (i.e. trapped
water vapor) in a direct relationship to the environment to which it is exposed.
And the degree to which the wood reacts to it's environment is both generally species-dependent AND dependent upon the particular example of that species.
AND it's confusing in that "hardness does not equal stability" which explains why rock-hard ebony can be more of a problem that are it's softer Rosewood neighbors....in general. "Hard Maple"??? moves far faster (i.e. faster moisture exchange) than certain softer woods.
However it must be said that the touring, professional musician cannot be expected to coddle a guitar to perfection. There are ways to acclimate a guitar for a regional tour (different topic) but for a big tour that occupies many months and many locales, over various seasons etc it's often the raw quality of the guitar build that presents the least trouble under "combat conditions".
9) Summary
-Fretboards dry/shrink and sometimes crack due to the loss of
water vapor
-Fretboard oiling does not prevent the exchange of
water vapor with the ambient atmosphere
-Fretboard oiling does not replace lost
water vapor..there is no water vapor in oil
-Fretboard oiling should be done rarely...a
light coat once per year is ok..do not soak the wood
-The only safe oil for a fretboard is one that dries
-Non-drying oils can damage the guitar; test for drying before applying to a guitar
no matter what the label claims
- The best fretboard maintenance = using the guitar regularly
- The only way to prevent
water vapor loss is to control the RH of the environment that the wood is exposed to
Hopefully this post will provide 100% of the information needed on this subject.
Enjoy making music!!!
Your friend in guitars,
Terry
Terry McInturff (aka TCM)
Terry C. McInturff Guitars"
Quelle > Klick <