Finding Glue Smears

[John Parchem]

Most glues show up under black lights. At one time it was a pain to own a black light fixture. But now you can buy LED black light flashlights dirt cheap used to find pet urine.

I took a picture on an instrument I just bound for demonstration.

[Herman]

That is a good idea John.
My former method was: Finish the guitar with high gloss lacquer and the smears will perfectly show.
Herman