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Decoupage is just a fancy word for gluing bits of paper over something, a bit like wall-papering . I think the trick is to water down the glue and saturate the paper in it so it moulds around the object.
An electrical sander is a must for removing the old finish, I used to use a cheap 140w orbital sander, it worked fine, just took a while, a 900w belt sander gets the job done a lot quicker though! A drill with a sanding disc attachment works well too but it can be difficult to get an flat finish (good for sides though).
It doesn't take much to remove the colour coat on most newer guitars (pre-90's are usually thicker), it's the sanding sealer underneath that takes a lot of hard work to shift (sand sealer is just more clear lacquer). If you don't like the look of the wood I'd just start covering over the sand sealer.
If you do go with a lacquer type finish I would recommend shellac, you can buy it pre-made or buy the flakes and make your own with meths. You can apply it with a brush or a rag and it really makes the grain pop, French Polishers use it, here's a few pics of a Stagg X400 alder body I recently stripped & finished with shellac. |
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