Thanks guy's much appreciated..

Something I have learned from this and from using multiple finishes is that the KBS is great to work with and produces an immaculate finish but more suited to modern machines.
I would recommend the KBS way to anyone with a modern pin that comes with a deep gloss finish from the factory.

For older machines such as 70's Solid State and earlier EM's the best finish that is true to the original is the Polyurethane but harder to work with. Cabbots Cabothane is the stuff for this and can be found at Bunnings, use the water based stuff. This gear is superb for a true SS or EM finish and this is what I will use in the future with my vintage machines.

Just love the playfield finish on my Sinbad with this stuff and plays really well. see pic below..

As for the Crystal Clear Acrylic, I used this on Strikes and Spares. Well done right is has a nice finish but once again not real true to the original but I used satin which didn't produce a deep gloss and looks great. I used spray cans and I don't really have a suitable place for this application so I won't be using it again.

As I said I have really learned a lot from each playfield so far and thanks everyone for all the friendly advice.

Cheers: Brettski... :)