2K is fuel proof, bird s**t proof and ordinairy lacquer not.
(is it a Acryl based lacquer or a quick drying cellulose?)
2K has more body ie. for more shine.
Ordinairy lacquer looks good when applied but after flash time will end up dull.
2K hardens chemically.
In any case after flash time, heat the parts to speed up hardening and resistance.
(like tempering)