Clive is exactly correct. 2k is the isocyanate finish that needs a "hardener" added as well as thinners, cellulose, synthetic and acrylic only need thinners, so are, by definition 1k. And yes, synthetic paint (known in the trade as "knacker laquer" because it reacts badly with EVERY other finish) is only good for lorries and cheap second hand cars you want to be shiny when you sell them!
The old cellulose based "knifing stopper" always was and still is pretty useless, to work at all, you had to leave it 24 hours between application and flatting, build it up 3 or 4 times and if you were VERY lucky, after that (possibly week long) process, it MIGHT not shrink and ruin all your hard work!
More modern stoppers are almost unanimously acrylic in makeup and all the better for it.
Bodyshops these days use an "extra high build" Acrylic primer filler which can be sprayed on neat, worked within 20 mins of application and doesn't shrink, so in the industry, stoppers are almost obsolete, only the pickiest places with the highest quality (and prices) bother with it.
Note:- because you asked for a fine grain FILLER (not stopper) the U-Pol Gold I recommended is exactly that! Though it needs to be worked with increasingly fine grades of paper for a top finish, if you do it right, you barely need a stopper anyway!
Steve
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