Hello again. i just saw your question on the other thread "would you recommend the brush on product, or should I stick with the can version ?"
For the etch primer i would use a brush and phoenix etched primer. its phoenix PQ1. put it on very thinly. its an acid in a paint but it needs to go as thinly as you can. you dont have to cover the item with the colour just make sure there is some residue on the item and it will work just fine. leave it fora good 24 hours and dont use it if the can is more than about a year old. (6 months if its something you are really proud of)
I really dont like using the aerosols. i have seen good results from them but i much prefer to have the control i can get with my airbrush.
If you dont have one you are welcome to come over and use mine. are you far from london?