I read somewhere where people use wipe on poly for the last few coats...
If you want go that route, just thin the poly your using 50/50 with mineral turps.
It's the same as wipe-on you'd buy but 1/3 the price.

I make homebrew wipe on all the time. It's just the right consistency for my airbrush, which is how I've been doing my necks lately.