I read the post HOW TO: Lined Fretless Fingerboard on how to turn a regular neck into a fretless. However, the post is from 2007, back when the dinosaurs roamed the Earth and there is a chance some things may have changed. Mine is going to be a budget conversion of a very budget instrument (long story, check my other post). I have some experience in defretting a neck (back in the 70s) and I think I can do it with minimal damage by using heat, tape, clamps and lots of care. My question is about the kind of Veneer that would work best and how to finish the neck. Finishing: I don't have a spraying boot and I don't think applying the finish with a brush would give me a good base, so I was thinking of using several coats of this: Minwax 33050000 Fast-Drying Polyurethane Aerosol https://www.amazon.com/Minwax-33050...ds=polyurethane+coating&qid=1581132513&sr=8-5 A1: Is this OK? A2: Is there something better? A3: How many coats? A4: I do have experience applying paint of various kind (mostly on metal as in a car and using pro equipment. I am not a complete idiot in this matter, but I am willing to admit I could be partially an idiot. Are there any obvious pitfalls I should be on the lookout for? Filling the Fret Slots I had a friend that made his own fretless using wood putty of some kind. AFAIK, he is still playing his bass and he is happy, but when I saw the tutorial using veneer to fill the slots, it made a lot more sense. B1: My biggest fear is buying the correct thickness veneer. Too thin would defeat the purpose, too thick I am afraid it may contribute to warping the neck. Could it? B2: Should I measure the slot after I take the frets out? B3: Some have used plastic inserts. Is that really an option? The bass is a Fender Jazz clone. I am not aware of frets having wildly different thickness, but what do I know? That's why I am here. One last disclaimer: I am not a gigging musician. I will play some, maybe a lot if I really like it, but I am not about to go on tour with the 'Stones. Plus I have a fretted bass I'll be playing as well (and I own a Cello, which sometimes I use as a bass as long as it's a simple line). In other words, this thing needs not be a tank. I am also not interested in reselling value. If I ever get rid of it, I will donate it. I do care somewhat about it not looking trashy and having the lines will certainly facilitate my fingering at first. On Amazon there is a dazzling selection of veneers, a world I was completely unaware of until today. Is there anything that could do the job there? Amazon.com: veneer NUTS! My final concern is the nut slots. I assume I'll need to lower the strings at the nut, but I have no idea by how much or what happens if I go too low. In the tutorial, unless I missed something, the nut is mentioned, but not in detail. C1: Clearly, I'd prefer not to have the strings buzzing against the wood. Is that even a thing on a fretless? C2: Is there a comfortable string height at the nut for fretless? The only live example I have is my cello, but construction is so different, the strings thinner and the action is so high, there is really little correlation. C3: Given all of the above, am I on the right path or should I rethink it? P.S. Does anyone sell fretless (but lined) necks that don't cost as much as a new Fender Squire? Thank you.