Quoted from SealClubber:Don't use water based cleaners such as Novus1 on a non-cleared playfield.
+1
Without lacquer or a clear coat, any water left behind is going to absorb into the wood. On completely bare paint I would extend that warning to Novus 2 as well - its less likely to cause problems and can easily be properly wiped up due to it's consistency, but it is also primarily water based and shouldn't be allowed to 'soak' into the PF.