They may have used enamal on the older cars but that was before acrylic and 2 pac and the main reason for designing a new product is because the older one was not cutting it and enamal was at least 2 different paint system ago which basicly means its useless .
Enamal will have a very short life span and can not be brought back once stuffed and can not be painted over later and in a engine bay the last thing your going to want is a complete sand off and redo .I have no idea why you would risk it when there are products out there as cheap or cheaper that will do the job twice as well and that will last .
Heres another person on another forum doing a car in enamal and the response from a painter/shop owner
And the paint wasn't acrylic - it was automotive enamel. It doesn't need to be buffed as acrylic does, which is good, but the downside is that it's more difficult to touch up when you come to correct any imperfections. I'm led to believe it's what people used before decent acrylics came along.
Response
What have you done Nick??
I don't want to rag on your work,and the I think the colours work well together.
But,why did you jam it up?Did the painter tell you once the enamel dies it won't cut back up,and I'd imagine up in that queensland sun that it will be mighty faded within 12 months.
The other big problem is if you ever want to repaint it all the enamel has to come off,nothing will go over it.
I would strongly advise against doing your door jambs,imagine how hard it will be to get it out of there if you decided to change colours down the track.
The worst thing is that you could have bought some cheap 2pack for about the same money,and it's not much harder at all to use than enamel.
Sorry mate,I just find it hard to comprehend the decision when I know that you love the car.__________________
__________________