Pug paint issues

The Pug has had some paint and body work repair attempts: basically the previous owner brushed on some sort of primer-surfacer.  Rather unsightly and though I am NOT a body work or paint person at all I feel I should make an attempt at reworking it to at least gain a uniform colour... I hope...
So I removed the headlight nacelle to be the guinea pig of my attempts to fix the paint problem.