Finishing the playfield
Even though I have had the playfield clear-coated and sanded five times (professionally!), even after the final coat, the clearcoat still sank around the inserts and could be felt to the touch. So I decided to try to flatten it once and for all, by sanding it with wet and dry sandpaper. Having investigated a bit on the internet, I decided to first sand with 600, then 800, then 1000, then 1200, then 1500, then 2000 and finally 3000 grit sandpaper. I was going to sand wet with water and a few drops of washing-up liquid, making sure to always sand in the same direction (along the length of the playfield).
After my first sanding with 600 grit paper, the surface naturally became dull. I took a photo at this stage and interestingly, the surface seemed glossy when taking a picture at an acute angle:
Playfield having sanded down with 600 grit sandpaper
Two and a half hours later and I had finally got down to the last grit of sandpaper. I finished off the playfield with Novus 2 and then Finesse-It (both being applied with the special adapter for my electric drill). Having finished, the glossy shine was back, the surface felt flat and the playfield looked great:
Finished playfield. Nice!
But then on closer inspection of my work, I saw there were scratches all over the playfield which appeared to go in every direction, implying they weren’t from my sanding of the playfield. Also, they were quite long and straightish, implying that they weren’t caused by the rotary polisher (my drill) either.
An area of the playfield clearly showing scratches
To be honest, I was disappointed. But not knowing what I had done wrong, I couldn’t correct it. Posing the question on my local forum got me the response that the grit I had started with (600) had been too course. I should have started with the 1000 grit. Whether this was the actual problem though will have to be investigated during my next renovation, as I’m now dying to get this machine up and running as soon as possible. And unless you look really closely, it’s difficult to see the scratches……