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I bound a fretboard a while back and used purfling as well as the binding. I glued on the purfling first and ran a fret saw throught the slots and thus though the purfling before installing the binding to allow the slot to continue throught the purfling up to but not through the binding as is standard practice.
However, upon recent inspection of the bottom of the fret board I noticed the slot coming through to the bottom of the purfling which is very slightly higher (not quite flush) than the bottom of the FB. I measured the depth and it looks like I sawed the fret slots too deep and almost right through the FB Theres only a hair left between the bottom of a couple of the slots and the bottom of the FB.
Is this FB a right off? Will it break at the slot when I hammer the frets in?

you;ll find out when it happens. I set my saw to be just a bit more than I need.

Glue it down before you put the frets in.

You could also laminate a thin piece of contrasting veener that has a 30 or 45 or 60 degree angle to the grain pattern and then glue to finger board. ( make the lemon .... lemonade... usually looks like something planned ..... a red wood looks nice against black and white binding... ) If need be you could re-sand fret board after laminate glue-up, if you haven't set the fret wire.

God Bless.

Kevin

Thats a great idea Kevin! I may just do that.

Great idea
often mistakes are learning possibilities and design enhancement opportunities