I have done partial clear coating with varethane. Kept the games for up to 5 years and they stood up well.
I have used 2k auto clear but only on full playfields.
The varethane is not as clear as the 2pac. But is quick, easy and basically odor free. If you sell the game and the new owner freaks out about the varethane, he can remove it using xyelene without ruining the playfield.
Others mileage may vary