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Saturday, March 26, 2016

Featured Restoration - The Corner

A chip at the corner

Hi Guitar Enthusiasts,

It has been really a while since my last posting. Setting up a guitar making workshop was indeed demanding. I started it in last April and I am still on the way. The process was demanding, exciting, interesting and above all, humbling. I guess I would not arrive to an end. This workshop setting up may as well as be a journey that never ends… perhaps when I get summoned to meet my Lord.

Anyway, this is going to be a short one… :) I will try…

A client brought in a guitar for repair. He sent me a text message reading,"I kind of smashed my guitar…"

The incident; when he was about to walk off with his guitar, he placed it in his foam gig bag and sling it over his shoulders. The only problem was he didn't zip the gig bag. The force of the swing launched his guitar up and away. It hit the ground on its headstock, it bounced off and landed on its back. Think about the sound of "the guitar" and the expression on my client's countenance.

From the top picture, you should be able to see the extend of the damage. A part of the picture was blurred out deliberately. In fact, the rest of the pictures were likewise.

I have initially advised my client to accept it as no structural damage on his guitar was detected. However he would like the chipped area to be reinforced to prevent further cracking or chipping.

I think it was a valid request so I took the job. At the onset, I couldn't determine the nature of restoration. The first thought was to sand it smooth and flood it with cyanoacrylate (CA) glue to stop any future cracking or chipping.

I pondered as I looked at the chip. Something told me that my initial thought was not going to cut it. Strangely I didn't realize the reasons for my hesitation however the reasons only revealed themselves in my mind after I have completed the restore work. Strange but true.

Here is why; the impact has dented the corner severely. The wood grains have been forced out of their natural directions. Even with smooth sanding, the wood grains would not harmonize and aesthetic value will go out of the window. It could probably get by but that was not why I took this job.

So… plan B got the green. I took my Japanese hand saw and cut the chipped corner away. See picture below.

The severed chip fell onto the board

From this point, some of you may already know how it ended, right?

I made a new "corner" from African Blackwood to replace the missing part. It was imperatives that this "corner" be made to size and as well as finishing before gluing it to cut part. If I have glued this "corner" first, I would be compelled to work this "corner" to size and finish with it attached to the headstock. No good at all…

The risks of damaging the existing areas were just too high to go down that path. Re-finishing was not an option as it would involve a lot more unnecessary work.

On the other hand, the difficulty of sizing and finishing a "corner" first was expected as well. Between a rock and a hard place, the rock was a better choice for me.

So I went ahead in making a "corner" to completion before attaching it to the headstock. The first attempt wasn't successful. It was indeed not easy. The second piece was better but it wasn't good enough too. Only at my third attempt, the outcome was decent enough to deliver to my client. See picture below.

A new "corner" glued

I send these 3 pictures to my client to seek for his approval. He has responded positively to the restoration work. He has collected the guitar with delight and appreciation. That makes my work meaningful.

Thanks for reading!

Monday, July 13, 2015

Bite Size Tips 005 – Spot Finish Restoration

Hi Guitar Enthusiasts, it has been a while since the last edition of Bite Size Tips. In this one, I shall feature a very popular topic, restoring dents and nicks on guitar finishing.

Every guitar gets dents or nicks in its useful life. It is almost inevitable. But remember, perfection itself is about having wisdom to embrace imperfections. Hence restoring such dents or nicks is never about getting the original (once brand new) state but to improve it and above all to engage our minds and hands to solve an issue.

Many guitar enthusiasts got fixated to the assumption of reverting their guitars to original state. That will bring nothing good for a person because doing the impossible will only end in agony and frustrations.

In this edition, I will attempt to explain the means which I undertake restoration works for dented finishing on guitars.

Dents on Top Board
The first picture showed an acoustic guitar with dents on it top board. Definitely not a welcoming sight to guitar lovers. Instead of thinking about approaches to repair the dents, many guitar lovers fell into a common thinking trap of wanting to get rid of the dent totally. With that inaccurate thinking, it will almost surely lead to a frustrating ending.

Let begin with understanding the damage in greater details. Guitar top boards consist of wood and its finishing, a.k.a. lacquer. In the first picture, those dents have surely affected both. What matters is deciding what to repair. The wood, lacquer or both?

In FRETS.COM, repairing wood dents are explained in details by Frank Ford, one of the masters for guitar repairs. If you are interested do visit the website for a good read.

Wood is malleable, that means it can be compressed, eventually altering in its shape. Most methods used for restoring wood dents are exploratory and nothing is certain. Mine is no exception as well. I shall focus on touching up the dented finish.

The knowledge base of finishing is vast and deep. It will take a long article to cover them. Hence it wasn't feasible to explain all these related information.

So let's to work. In this case, only a spot received the repair attention, I shall call it Spot Finish Restoration.

Assuming you know the type of finish is on the guitar to be repaired. Always use the same type of finish for filling work. While all clear lacquer look alike, they do share their differences. In restoring finishing, we want to avoid having adhesion problems because of their different chemical make-up.

First step - fill up the dent(s) with sufficient lacquer. If multiple coats are required, allow each coat to set before the next is applied. Make sure the filling covers the dent(s) in both depth and area. Give sufficient time for the filling to set.

Drop fill to cover dent

Second step - remove any excessive filling with a prepared razor blade. Tape up a razor blade as shown in the picture. The razor blade is going to used as a scraper. We want to scrape away the excessive filling but don't want to scratch the top board. The goal is to get as much filling removed so that the filling is almost leveled to the top board's finish. However you will find it hard to achieve. Nevertheless, we wish to minimize inflicted more damages other than the existing dent(s) itself.

Prepared Razor Blade

Third step - Scrape the filling conscientiously with the prepared razor blade. Get the filling as level as possible. Do check the tape on the razor blade, make sure it didn't get slice through in the process. Visually inspect the process to prevent over-scraping. Stop when you are satisfy with the level of the filling.

Scraping Excessive Filling Away

Fourth step - wet sand the affected area with sand papers in graduation grits, begin with 400 and stop at 2000. In preparation for wet sanding, I soaked all the required sand papers in water prior to using them. Take cautious and do not over sand. A concave area can form or worse, the lacquer gets totally removed and leaving raw wood exposed. Both are bad for the guitar.

Wet Sanding

Fifth step - if the previous steps were done properly, this final step will be easy as a breeze. That is to buff the area to shine. Buffing requires a polishing agent and there many such products available in the market. For this, I have selected the Premium Polishing Compound from TurtleWax. For rubbing the compound onto the guitar, use micro fiber or lint free fabrics.

After Wet Sanding

Ready to be Buff

Buffing to Shine

Completed

Turtle Wax

In conclusion, it may not be perfect, there might be a patch that is visible under strong lighting. But it is better then leaving dent on the guitar.