After being inspired by the one I seen online here he is G1 Starscream TFA Style!
Hes primarily a repaint but I did make some noticable changes such as the arm guns that now attach in jet mode, and a newly designed head that makes screamer look more screamerish!
It all depends on the job in question. Screamer here was lots of larger panels so I primed him with grey primer after diasasembly. Any parts that didn't get covered wear then hand brushed with Fortress Grey, after the priming I used Enchanted blue, Blood red, Bad Moon yellow, and various other hades to give hi the classic G1 scheme.
The key it to not paint to much. keep your paint semi waterish and flow over the piece not try "brushing" it. Do this about 3 times and you get the effect I got here.
Some figures I do not pull apart as 2 many small parts turn into a huge mess and its just as easy to hand brush the entire piece.
-Renmauzo