The process I used to get mine to white was this...
Started with lane screen, cross sanded 2 ways.
Then went to 220, then cross sanded 320, then cross sanded 400, then cross sanded with 600, then finished sanding with 1000.
After that, high glossed it with Brunswick Factory Finish High Gloss.
It took about 30 minutes.
And yes, you can find some of the discontinued ones really cheap. I'm thinking of taking several of the ones in our shop that we've had for a few years and making them white....They will sell for sure.
Oh yeah, as far as plugging a viz, there is really no way to preserve the image.
RoB
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If ya ain't throwin' Brunswick.....Ya ain't maximizin' your abilities. Get ur done with Brunswick !!!