If you do recoat, use penetrol, from flood company to thin, instead of turpentine. It will lay down nicer, and it won't kill the gloss like thinner does if you use too much.
The varnished box on my truck distracts everyone from my paint job.
Denny, you think sanding a truck is bad. Its a vacation, I often am looking down a 40 foot wooden hull, faced with a similar task! Plus I'm cheap. So very cheap. Work trucks need touch ups.
If I had the money, I'd do it the right way, but I don't. So, I have to improvise. Part of the great thing about using a truck like this for work, is that it doesn't have to be perfect, it has character, and patina, not flaws!!!!
If you do it, scuff it with #400 grit- go crazy with the roller.