Anyone ever do touch up paint for Gentex helmets? Air tractor blue or dark blue gloss, I believe its PPG that makes it. Anyone else got a better paint code or something else that worked minus sending them in for a respray?

Better off in the long run to send in for a refurb. 

I spray my own. One rattle can and a roll of tape and alot of cardboard boxes to cover a corner of the garage. Multiple light coats. Best $10 you will spend.

Back in the day, I repainted two SPHs with the 'rattle-can' and, as DIY stated above, you can achieve excellent results. Several friends later asked if I could paint theirs as well so, I acquired an airbrush and started using Imron. Not being an artist and before the internet to download and print design stencils or decals, I dabbled with pin striping and used un-pigmented or clear paint (clear or top coat - sometimes many top coats) to smooth the finishes and add a tad bit of flair. The novelty however, wore off after number five.      

Try some of that caliper paint.

If your helmet isn't scratched up from a 500 door frame do you even a helmet?

Try an autobody shop, no joke. Took my shell to the local shop, asked if he had any projects coming up that involved squirting a med blue coming up. A week later had a med blue shell & visor with a touch of metalflake and clear coat. Paid him fifty bucks, that's what he charged me.