I would use two coats of resin on the outside, gives you something to sand into for those small paper lines. The regular filler will be harder/better. Yes you need 80-200 grit sand paper I use up to 400 if I want a really smooth finish. Primer/sand repeat till you have the finish you want. I use a primer filler at this step to fill in all the small lines and/or pits. Then paint, this you should take some time to come up with what you want it to look like. Looking at you're helmet you probably can get away with very little bondo work, Nice pep job by the way.
I hope this was helpful.
Yep thank you.
I was already thinking of using normal body filler on the helmet.
If I put body filler everywhere outside it will be harder to work on the small pieces right?
In that case can't just put 4 layer of resin on them?
Damn, I feel like a kid during the night of the 25th December, waiting 'till morning to open gifts ehehehe, last time I felt like that was soo much time ago hehehehe.
Yesterday I finished cutting the chest pieces and started to glueing but only 30 mins of work.