smooth it down so its something like then primer it, as you flat it you will see the bits you missed which should just be little marks. Fix that with stopper like this and flat it down
You dont need a base coat but its the easiest way to see imperfections, i used a silver one as i was going to paint it candy blue but with being fibre glass it would take too much work it isnt flat enough. This will also show up what you missed last time
So more stopper then and flat it off.
Then its into the spray booth and yes that is the back garden in January
So finally now to paint it
This is 2 pack so its mixed 2:1 with hardener and about 10% thinners. Go steady and mist coat the the bits that arnt painted to cover them first 
Dont try and cover it all at once just build up the coats and let the paint flash off or dry a bit between each coat you put on about 10 minutes or so depending on temp.
this is after 5 coats i think but only because i mixed more paint that i needed 2 or 3 should do it depending on the colour etc.
So what finish can you expect painting things on the washing line? well one like this so before you say you cant do that have a go first before you pay someone.
i dont know if that was helpful or not but hopefully it will of given some of you the idea to say i reckon i can do that.
I will add to this if anyone wants me to when i get round to putting the other colours on over the green.
