Acrylic clear can be found at any hardware store for about $10 a can.. its not bad stuff and quick drying, ive used it to seal glasses and restored aprons. It comes out a little fast thats all so several light coats are best way to go. As for using it on a PF, it would be harder wearing than Mylar, it is VERY easy to apply and can be removed if required later down the track with all purpose thinners - it turns it to jelly and just wipes off.
 2K is harder wearing and nasty to inhale etc - pretty toxic stuff, it also eats a lot of paints.
Now... ALL CC is prone to fish eyes etc.. even pros  applying have difficulties and often have to rub back and reapply to get a real smooth finish. Personally, i reckon CC is vastly overrated.
For home use the acrylic is good and forgiving, if you stuff up and fish eye it can be rubbed back and you can do several coats in one afternoon.

Polyurathne ( CFP) is even better - comes in 2K also and again available from Bunnings - is harder wearing and recommended for timber floors ( a stilleto will do 100,000X more damage than any steel ball and this stuff copes with that)... takes longer to dry but really easy to use and is not  prone to fish eye. If your paint is fully dried it will not eat it. Can be applied very thinly and has VERY slightly yellowed finish ( negligeable on thin coatings) that matches EM and early SS coatings. Clean up real easy. If you stuff up then it has to be removed before it cures with turps etc.

CC really only comes into play for DMD's to match the finish...

P/thane will see you good for anything else is more authentic