x-5 is tamiya's green paint so for a TS spray u might want to check out TS-9 British Green or TS-43 Racing Green which are close matches.
It would not be a good idea to use white spray as a primer coz afterall u would normaly use a primer under the white spray. I use auto primer which i get in huge 500ml cans from Halfords in UK, look for something similar.