Swinger 1969, testfitting engine and painting is going on

Car looks great. Why water soluable paint? Does it lay out the metallic paint better? Is a different.paint gun needed? Was the clear solvent based?

Here is in Finland it is hard to find any other kind paint than water soluable paint. It has something to do with environment laws. Anyway, it no harder to paint. I use High Volume Low Pressure (HVLP) paint gun. And yes, the clear coat was solvent based.