Quoted from Marten:
The Chinese are capable of producing quality products but not at the price we are asking them to do it for. You get what you pay for!
Yep. China will make whatever you want on-spec. You have to watch them since some of the shadier manufacturers will try to "cost reduce" on reorders without telling you, but once you find a few good ones, you stick with them and they will turn out quality work. They just won't do it for nothing. Those Whirlwind discs should have used pantone colors, but I bet they just screened them. They're WAY off from what they should be.
Having done this, reproducing and manufacturing the Shadow Supersets in the Gene days, part of the problem is you have to make a lot to get the price down, but then you sell half and sit on the other half as it trickles out for years to make a few thousand bucks. And if things go wrong (as it did on the first run of Shadow Supersets with ink adhesion) there go your profits (I replaced all the bad sets free). It's risk/risk with little reward. If you're going to make more than one category of repro at a time with any kind of quality control and faithfulness to the original you have to be stacked for cash and very patient.