Laquer is sprayed on, always. Super glue should be thin. Coating up until a thick gunky mess is acheived which is then sanded back without sanding through to the wood in various places (impossible). Epoxy is the best finish for fretless. Ebony is hard enough as it is. Any paint/laquer or varnish will not protect from string wear for very long and you would just end up having to strip it all off again within days of playing. Poly goes on pretty flat and just needs buffing but is not nice stuff as said above. Leave it as it is would be my first suggestion, epoxy being my second.