That lacquer spray coat doesn't do anything to actually protect the disc, or increase longevity. The problem is the adhesive of the surface, and nothing can be done for it. If anything, the sprays can exacerbate destruction of the label layer, as chemical interact.
The spray coats were always to prevent water damage -- and supposedly "UV" type damage, but that also doesn't do anything). Nothing has prevented fading or long-term degradation of the inks.
The biggest issue with the spray is that those were like sticky labels, in that those can throw off the balance of the disc. So it's essentially "coaster spray", as it makes a good disc a coaster.
Those sprays were in the nonsense category of "DVD safe markers".
The entire "inkjet disc" market has collapsed in the 2010s, for the reasons I stated back in the 2000s.
If you do this, make sure it's just a "pretty" copy, not a master.
