Quoted from boilerman:king pin looks great! one of my favorite games.
what type of clear did you use? 2 part or 1 part clear?
Thanks Dave! 
Well I did not use VID1900's approach (ducks stones being thrown and heroically runs away). I used a 1 part clear oil based Polyurethane with 2 coats brushed on that self levels. I used a good oil based 1" brush, do not use the foam brushes as they are crap and leave air bubbles that you have to go back over with the good brush to get rid of. I did sand before and after the first coat, but will most likely skip that next time as I hate sanding as it caused me problems with the clear that I had to correct and will attempt to use an acid etch approach next time using white vinegar that leaves no sanding dust and worked great for me in the past when I would paint over old chromed surfaces. You only need 2 coats of this stuff to make the playfield as protected if not more protected than the original 2 lacquer coats that were applied from the factory.
Vid's biggest gripe and I agree is that it yellows a bit but if you already have a Playfield that is quite a bit yellowed already from the nicotine of the ages then it just brings out a nice deep glow to it as you can see from the pictures. I know he also says if it is put in the direct sunlight it will yellow more. Well I agree that could happen too but who leaves their pinball machines that they love in the direct sun all the time to either fade their Cabinet paint and/or deepen a yellow on a Clearcoated Playfield? Sure isn't me.
Also the fumes are not horrible and I was able to clear the Playfield indoors right in my arcade without a mask or anything, just make sure give yourself some air breaks. do not have your head too close while applying it, and crack a window open for some ventilation. After i was done the Playfield sat for a few months before I had time to put the game together which gave the Playfield clearcoat plenty of time to get rock hard.
Here are a couple pics of my King Pin vs Abra Ca Dabra. King Pin with the new Poly coat and ACD with the original waxed lacquer coat, both yellowed about equally prior to the Poly coat on the King Pin. The King Pin looks richer too me, easier to see in person than the pics but you can still get the picture. The interesting thing is that the King Pin plays like it has a lacquer coat and is not super slick like a 2 part clear would be which is nice if you want to retain that original EM Playability.
On a final note I would say only use the Poly oil based and not the water based as we all know water is bad for a Playfield and the product to me is inferior anyway. Use only if your Playfield has a deep dark yellow to it, if you have a nice light looking Playfield do not use this product, use a 2 part auto clear instead especially if you clear a reproduction playfield.
Just my 2 cents.
Ken
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You know I want to make it up to you.......maybe I can...........wait...........oh WOW! 
My bad. 
Need to get more practice on that one. 
Reno, NV
To bad all the EM vampire themed pins were lame on both artwork and gameplay IMO.
