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There is nothing wrong with 2K primer or clear coat.
There is everything wrong with having to use a colour which is only available as a 2K single stage. You’ve got to get full coverage on at a push three coats, wait for a day for it to dry, carefully wet sand it avoiding rubbing through on all the tiny sharp edges bike have, then do your graphics as normal and then clear coat it with your chosen 2K clear cloat.
euan
So what exactly is the problem with modern 2K? Is it something to do with application & drying characteristics?
My first ever real job was developing paints for industry many moons ago, making paints from scratch & testing them on various surfaces & for different applications. There shouldn't be any reason you can't modify twin-packs to behave as you want. IIRC using different activator/thinner ratios will change how paint applies & dries