Can i use a 2 pack paint without the hardener, just like it was acrylic? I have 5 litres of clear lying around my house that says i need to use a hardener. I'd hate to waste it.

In a word no, 2 pack requires a chemical reaction to go hard

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

Big fat no, it would never harden. Just get the hardener and use it.

if you buy the hardener then you won't be wasting the paint

Hell No.... You can and you will get that nice wet finish, however it will never go dry.

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If it cant be fixed with a hammer it cant be FIXED!!

As said already, it will NEVER cure.

But you can buy the hardener seperately

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Too many cars, and too little time.