Quoted from tonycip:thanks everyone, I was more wondering if it would be a good idea to seal the back side or not, regardless if its with gray paint or a clear .
If you prefer the look of grey, go for it. But if a CPR playfield doesn't have a grey backside, it doesn't mean it's not sealed. It most certainly is. We roll on either Varathane Diamondcoat (water based) or MinWax polyeurethane (oil based). Depending on what stock we have on hand. It soaks into the grain, later give it a 220 grit buzz to smoothen the swollen grain, and that's the backside.
No CPR playfield has ever had an unsealed backside.
Hope this helps.
KEVIN
Classic Playfield Reproductions
http://www.classicplayfields.com
Livermore, CA
Dunakeszi
