I don't know that product specifically but I don't think it's likely to work very well. Unless it is really thin and can get down into the pores of the wood, I can't imagine that it would stay put. It would also probably look/ feel bad.
If the guitar really holds sentimental value for you, why not replace the fretboard?
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1943 Gibson J-45
Martin Custom Shop 000-28 Authentic Aged 1937
Voyage Air VAOM-4
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