Hot Rods Paint: 2k primer question

I was just about to spray some 2k primer, reduced to use as a light sealer coat over epoxy primer.

I just realized they gave me an ISO free hardener. Can I still use this hardener being that it will be a light coat to seal the epoxy?

No info on tech sheets and I spent 45 min on hold before hanging up. So I thought I'd ask the question here

Thanks

 

Perhaps knowing what the products are might help people give a reply.

 

Ah sorry about that..

Custom shop 2k primer/sealer kup-405
Custom shop ISO free hardener kfp-306

 

They actually just called back and confirmed you can't use an ISO free hardener with the regular 2k primer

I kinda knew the answer to my own question, but just thought there might be a slight chance of the two working out together, and saving myself a 2 hour round trip drive.

Thank you though