It was more of a contrast than I actually expected. After 15 years, some tan line is normal, but this was a lot. This 410 came to me used in a trade a couple of years ago, so I don't know its history of prior sunlight exposure.
Just go very slowly and don't be aggressive about pulling upward away from the spruce top. Work in a way that peels it back on itself, rather than lifting away from the top. Try to use shear against the adhesive, not lifting force. Go slow and easy - don't force anything. I use a similar technique to remove stickers or price tags, trying to let the peeling process take the adhesive with the thing being removed. Young spruce can pull up strings of fibers, but after a few years it should not be an issue.
Several years ago, I spoke with customer service about pick guard removal on a relatively new four year old 414 that was already peeling up at the corners, and they sent me a tech sheet about removing and reinstalling pick guards. (This tech sheet no longer appears on their web site. They would rather you have your dealer do this work, but I convinced them I was a handy guy). They recommend using moderate heat to soften the adhesive. When the material softens and the wood grain starts to "print" through the PG, then it just peels right up, easy-peasy. I first started this project by trying heat, but the only hair dryer I could find around the house did not get very warm. Then I went looking for a hot water bottle, with no luck. Heat would have made it all go easier I'm sure. There are other tricks, like using dental floss to "saw" under the PG and lightly flooding the lifted area with some naptha (I used Ronsonol lighter fluid) to soften the adhesive at the edge that is being peeled up. Ronsonol also helped clean up the leftover adhesive residue. Unfortunately in this case all of the adhesive layer stayed stuck to the guitar and was a mess to clean up. The removed pick guard is very clean on the back side.
Having seen that tan line, I now really wish that I had removed the pickguard on my all koa 424 right away when I got it. It was already two years old then, and is now nine. While it has not seen much daylight exposure, but I'm sure there is still some tan line. If I could convey one wish to the factory, it would be that
new guitars come with the pickguard unattached in the case, rather than pre-installed on every guitar. Bad enough they cover nice spruce, but it borders on criminal that they cover up gorgeous top woods like koa or quilted anything with opaque pick guards. Ask me how I
really feel about this topic.....
