I can use to fill a carved piece of wood up to a flat finish?
Most guitars . . . Fender are encased in poly urethane. Will this shrink and
have slight but still noticable depressions?
I want to carve something into my guitar and then fill it so that it has a
completely flat finish without any minor depressions?
I'd have asked a luthier but there's no luthier or guitar builder groups.
Better to ask materials scientists experts.
Find a cheap/broken/replacable guitar to experiment with. And
understand that the following advice is only worth what you paid for
The best approach would be to fill the depression by making many
coatings with each coating being a very thin layer. This approach will
take a good deal of time, but it can be done. The Japanese make
beautiful coated pieces that have up to 1000 layers on them. So adopt
a Zen master approach and proceed. Make sure each layer is thoroughly
dried and cured before adding the next layer, or the whole thing may
look cloudly. Be sure to following the recommended safety procedures
for applying the coating as some of them could contain solvents (good
ventilation, proper gloves, no ignition sources nearby, ...)
Two options to consider. The first is to use the same coating that is
already on the guitar. The guitar manufacturer might be willing
identify what the material is.The second option is to use a totally
different material. This will create a difference in refractive index
between the two coatings which will cause that interface to stand out
more than if you used the first option. The greater the differences in
refractive index, the greater the impact.
As the depression is finally filled, you will not be able to match the
exact height with the existing body, so you will need to
sand/polish/buff the area to accomplish this.
Aspen Research, - www.aspenresearch.com
"Turning Questions into Answers"
Opinions expressed herein are my own and may not represent those of my
Hobby shops carry two part clear resin systems designed to pour into
molds and cure bubble free. They do not shrink on curing. One of these
will work for you.
Resins carried by solvents will suffer from the shrinkage you worry
about because of the loss of solvent volume during hardening.
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