Many years ago I discovered that spray cans are for car suspension parts NOT amplifiers!!!!
I bought a small Chinese compressor, and a half decent Chinese spray gun. $125 or about 70 quid for you.
A litre of hammertone costs about $40 Australian, one litre is enough to paint 20 LARGE chassis. To make a really nice job, you can use spray bog as a filler and sand down to suit your taste.
Several millenia ago I used spray cans in the house and mum chucked a REAL wobbly!!!
and I didnt spray the carpet
.
I am spoilt I guess as its about 30 degrees C for most of the year, and I dont have the English rain and cold to deal with. I do however have native Australian bees!!! They just LOVE drying paint to die in!!. This leaves "leg ends" stuck in the paint after its dried and I rub their bodies off the surface.
To beat this ( AND it will protect your carpets) I go to the supermarket and get a LARGE cardboard box, ( a fridge box maybe ?? ) that I lay on its side, with the open end facing me. I stick a couple of holes in the top and use mig wire ( ONLY because I have it) to hang the chassis/parts to be painted. A heavy chassis will need a wooden rule on top of the box to spread the load when the wire is wrapped around the rule. Spray inside the box.
An alternative to hammertone is "satin" enamel!! I use "Killrust" brand. It tends to hide small defects, and doesnt run easily. Its available in spray cans too!!.
Keep up the good work
Joe