Quite like POR15 - at least in terms of applying it - much easier to get a good finish. Not sure it is as hardy as Smoothrite though. Will be dropping the subframes on my MGF - one is painted in Smoothrite, the other with POR15. It will be interesting to see how they compare.
Not tried EM121 before - I shall have a look!
Not tried EM121 before - I shall have a look!