Would love to buy a proper base, but I just found out that I finish my job in 4 weeks, so financially, it's just not going to happen at this stage. So for now, I have to work with what I've got. I spent a night sanding the high points of the base down, measuring every 0.01 of a millimetre. Works much better, but still far from perfect.
First run from yesterday, print now mounted with spray adhesive, printed with unmixed Pantone Red:
I'm happy enough that it's a clearly defined low area. Much better than being a few areas. Just to make sure it's definetly the base and nothing else, I temporarily pasted paper strips behind the patch, then did a second run:
So it's definetly the base.
Spent a bit more time yesterday making it a less dodgy paper fix, so I could get a little closer to printing the actual cards (yes that's right, 3 colours in one day!). I still have a problem spot, but it's not base-related this time. Low point on the photopolymer?
And here's where I'm up to. Still patchy, and some uneven inking to boot, but it's getting better each attempt:
I've got a whole day to work on it again now (and if I can't find a job in the next 4 weeks, I'll have 7 full days a week to work on it... sigh).